Editing Mario & Sonic at the London 2012 Olympic Games (Nintendo 3DS)

{{italic title}}
{{about|Mario & Sonic at the London 2012 Olympic Games for the [[Nintendo 3DS]]|the [[Wii]] version of the game|[[Mario & Sonic at the London 2012 Olympic Games (Wii)]]}}
{{game infobox
|image=[[File:Mario & Sonic at the London 2012 Olympic Games (3DS).jpg|225px]]
|developer=[[Sega]]<br>[[Nintendo Software Planning & Development#Group No. 4|Nintendo SPD Group No.4]]
|publisher=Sega (NA, EU, OC)<br>[[Nintendo]] (JP, SK)
|release='''Retail:'''<br>{{release|Europe|February 9, 2012|Australia|February 10, 2012|USA|February 14, 2012|Japan|March 1, 2012|South Korea|June 21, 2012}}'''[[Nintendo eShop#Nintendo 3DS|Nintendo eShop]]:'''<br>{{release|Japan|November 1, 2012|Europe|May 30, 2013|Australia|May 30, 2013|USA|June 20, 2013}}
|languages={{languages|en_us=y|es_es=y|fr_fr=y|de=y|it=y|nl=y|jp=y|kr=y}}
|genre=[[Genre#Sports|Sports]]
|modes=Single-player, Multiplayer, Wi-Fi, Story Mode, Record Log.
|ratings={{ratings|cero=A|esrb=e|pegi=3|usk=0|acb=G}}
|platforms=[[Nintendo 3DS]]
|media={{media|3ds=1|3dsdl=1}}
|input={{input|3ds=1|3dsstylus=1|3dstilt=1}}
|gallery=Mario & Sonic at the London 2012 Olympic Games#Box art
}}
'''''Mario & Sonic at the London 2012 Olympic Games''''' the third installment of the [[Mario & Sonic (series)|''Mario & Sonic'' series]], taking place in [[London]], the host city for the {{wp|2012 Summer Olympics}}. Much like the other games in the series, the game is largely based around the 56 minigame-like [[Event]]s, the most featured in a single installment in the series' history, with various modes allowing for the events to be played in different formats such as medleys and offering both single and multiple cartridge multiplayer for the mode. In addition to this, the game features a new Story Mode, centered around a plot based on [[Bowser]] and [[Dr. Eggman]]  trying to stop the Olympic Games taking place using the [[Phantasmal Fog]], in which the player completes various event challenges to progress. The game also has a number of collectibles in the form of badges, and also allows the player to view online leaderboards of records for certain events. ''Mario & Sonic at the London 2012 Olympic Games'' marks the first installment of the series released on the [[Nintendo 3DS]], and was released roughly three months after its [[Mario & Sonic at the London 2012 Olympic Games (Wii)|home console counterpart]] on the [[Wii]].

The game could be played over [[Nintendo Network]]; however, the service was terminated on April 8, 2024, making the game no longer playable online.<ref name=Shutdown> {{cite|author=@NintendoAmerica|date=October 4, 2023|title=As of early April 2024, online play and other functionality that uses online communication will end service for Nintendo 3DS and Wii U software. Thank you very much for your continued support of our products.|url=x.com/NintendoAmerica/status/1709418623566020975|publisher=X|accessdate=February 17, 2024}}</ref><ref name=ShutdownUpdate> {{cite|author=@NintendoAmerica|date=January 23, 2024|title=Update: as of 4/8, online play and other functionality that uses online communication will end service for Nintendo 3DS and Wii U software. Thank you very much for your continued support of our products.|url=x.com/NintendoAmerica/status/1749963072998166670|publisher=X|accessdate=February 17, 2024}}</ref>

==Gameplay==
===Olympic Mode===
Olympic Mode is the main mode within the game, and is based around playing the game's various events. Much like the other games in the series, each event is structured like a short minigame based on an Olympic event, where a winner is determined from the four entrants. Each event has a unique objective and control scheme, menaing that different events have varying lengths and difficulties. The mode can be played in both single player and multiplayer.
====Highlight Match====
In this mode, the player plays a single match of an event using the standard rules. For each event, the player an select a COM Level which determines the difficulty of the computer-controlled opponents from Easy, Normal and Hard. A medal can be earned for each COM level in every event, however earning a medal at a higher difficulty level will also earn the medal for lower ones. For example, earning a gold medal at normal COM level will also earn the gold medal for easy if the player does not already have the medal. The player can select their character for each event from the four available for the entry character class, with each event being assigned one of the five character groups. After completing each event, an award ceremony is held, during which the final placements of all of the characters are shown on a podium. If two characters tie for a position in an event, through having the same number of points for example, they will both appear on the podium in their respective position. For events in which the player controls two or four characters as a team, only the players' characters will appear on the podium and will do their victory animation for their placement. The characters will appear on a podium even if they place fourth in the event, whereas only those in the top three stand on the podium for single character events, with the fourth place character off to the side. After the awards ceremony, the player is given the options to replay the event, choose a different event to play or return to the main menu.

Certain events require the player to select a team of either two or four characters to play the event. For these events, extra teams made up of non-playable characters are added for the event. In two-character team events, the extra teams are a pair of [[Chao]] and a pair of [[Koopa Troopa]]s. The teams never physically appear in the events, and in events where the player is required to directly compete against a COM team rather than using a score to determine the rankings, the player can only place first or second in the event as the Koopa Troopa and Chao teams will always place third and fourth. For the events that require the player to use all of the characters in the class, the COM teams will be made up of green, yellow and blue [[Shy Guy]]s. The Shy Guys only physically appear in [[4x100m Relay (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|4x100m Relay]], with their times and scores being used for the other events of the type.

====Medley Match====
In Medley Match mode, the player can compete in medleys made up of several different Olympic events to earn points, aiming to score more points than their opponents. For each event, the player will receive a number of points based on their placement in it, winning 10 points for first place, 6 points for second place, 4 points for third place and 2 points for fourth place.

In this mode, certain events are always treated as bonus events, giving them slightly different rules and awarding different point scores at the end of the event, mainly based on the score that the player achieved. The following events are treated as bonus events:
*[[Marathon]]- Only a single round of the event is played, with the score being determined by the water bottle that the player grabs. The characters are ordered in the reverse order of their current overall placement, such that fourth place is in the lead while first place is at the back. Collecting the rainbow colored water bottle scores the player 15 points, the blue water bottle scores 10 points, the white water bottles score 5 points each and failing to collect any of the water bottles awards the player 0 points.
*[[Basketball (event)|Basketball]]- The player will have a short practice session with a cursor before being able to make a single shot without the cursor to determine their point score for the event. The color of ball that the player receives depends on their placement in the medley, with higher ranked players receiving worse balls than the higher ranked ones. White and orange balls are worth 5 points, blue balls are worth 10 points, and rainbow colored balls are worth 15 points.
*[[Handball]]- The event is played as normal with ten shots thrown by the Egg Pawns, and the type of balls thrown depending on the player's placement, with lower-ranked players receiving more multiple point scoring balls than those in higher positions.
*[[Football (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Football]]- The event is played mostly as normal with only five shots thrown by the Shy Guys, and different types of balls thrown depending on the players' placement, with players in low positions receiving more multiple point scoring balls than those in high positions.
*[[Keirin]]- The characters start the event with advantages based on their placement, with the fourth placed character starting further ahead than the third place character and so on. The event plays as normal, but scores are awarded so that first places gets 15 points, second place gets 10 points, third place gets 5 points, and fourth place does not receive any.
Upon creating a new file, the player completes the Warm-Up Medley consisting of three events, [[100m (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|100m]], [[100m Freestyle (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|100m Freestyle]] and [[Judo]]. Any records set during this medley do not count, and the player cannot see the results of the events. This medley is not available in the game afterwards.

There are two ways to play Medley Match, standard mode and quick mode. Standard allows players to choose a character from each of the groups, as well as allowing them to set and select a group of favorite characters. When playing two-person medleys, the second character will be randomly picked, and when playing team medleys the player's selected character will be the lead character. Each event shows the player the instructions screen before playing, and also provides intermittent screens between events showing each player's current position, point increases and position changes and often features commentary from Toad, Wenlock and a Chao about recent occurrences. In the quick mode, all of these things are absent, with the player receiving a random selection of characters and their current position in the medley and number of points being displayed in the bottom right of the Touch Screen during the events. The quick mode is the only mode in the game where the main instructions screen of an event can be fully skipped.
=====London Games=====
London Games mainly consists of medleys based on a selection of events from a specific class, but also features some medleys that are a combination of classes or based on the team size instead.
{|class="wikitable"
!rowspan=2|Medley number
!rowspan=2|Medley name
!rowspan=2|Team size
!colspan=5|Events
!rowspan=2|Unlocking criteria
|-
!1
!2
!3
!4
!5
|-
|1
|Footrace Medley 1
|1
|100m
|3000m Steeplechase
|20km Race Walk
| - 
| - 
|Default
|-
|2
|Footrace Medley 2
|1
|110m Hurdles
|background=yellow|Marathon
|1500m
| - 
| - 
|Complete Footrace Medley 1
|-
|3
|Field Event Medley
|1
|Long Jump
|Triple Jump
|Pole Vault
| - 
| - 
|Default
|-
|4
|Throwing Medley
|1
|Shot Put
|Javelin Throw
|Hammer Throw
| - 
| - 
|Complete Field Event Medley
|-
|5
|Aquatics Medley
|1
|100m Breaststroke
|100m Freestyle
|100m Backstroke
| - 
| - 
|Default
|-
|6
|Gymnastics Medley
|1
|Rings
|Balance Beam
|Horizontal Bar
|Floor
|Trampoline
|Default
|-
|7
|Cycling Medley
|1
|BMX
|background=yellow|Keirin
|Sprint
| - 
| - 
|Default
|-
|8
|Swim/Run Medley
|1
|1000m Kayak (Singles)
|BMX
|Omnium
| - 
| - 
|Complete Footrace Medley 2 and Aquatics Medley
|- 
|9
|Shooting Medley
|1
|Double Trap
|25m Rapid Fire Pistol
|Archery (Individual)
| - 
| - 
|Default
|-
|10
|Court & Field Medley
|1
|Badminton (Singles)
|background=yellow|Basketball
|background=yellow|Handball
|background=yellow|Football
|Tennis (Singles)
|Default
|-
|11
|Contact Sports Medley
|1
|Judo
|Fencing - Epée
|Boxing
| - 
| - 
|Default
|-
|12
|Contact & Power Medley
|1
|Taekwondo
|Weightlifting
|Wrestling - Freestyle
| - 
| - 
|Complete Court & Field Medley and Contact Sports Medley
|-
|13
|Pentathlon Medley
|1
|Modern Pentathlon
|Archery (Individual)
|Triathlon
| - 
| - 
|Complete Contact & Power Medley
|-
|14
|2P Court & Field Medley
|2
|Beach Volleyball
|Table Tennis (Doubles)
|Hockey
|Water Polo
|Badminton (Doubles)
|Default
|-
|15
|2P Aquatics Medley
|2
|Water Polo
|Synchronised Swimming (Duet)
|Platform Diving (Synchronised)
|Canoe Slalom (Pair)
|Sailing  - 470 (Pair)
|Default
|-
|16
|2P A La Carte Medley
|2
|Hockey
|Badminton (Doubles)
|Table Tennis (Doubles)
|Synchronised Swimming (Duet)
|Beach Volleyball
|Complete 2P Court & Field Medley and 2P Aquatics Medley
|-
|17
|4P Co-op Medley 1
|4
|Rowing - Quadruple Sculls
|Show Jumping (Team)
|4x100m Relay
| - 
| - 
|Default
|-
|18
|4P Co-op Medley 2
|4
|Archery (Team)
|Rhythmic Ribbon (Team)
|Synchronised Swimming (Team)
| - 
| - 
|Complete 4P Co-op Medley 1
|}
{{br}}

=====Variety=====
Variety Medleys are made up of events that are grouped together based on things like the type of gameplay or input used in the events.
{|class="wikitable"
!rowspan=2|Medley number
!rowspan=2|Medley name
!rowspan=2|Team size
!colspan=5|Events
!rowspan=2|Unlocking criteria
|-
!1
!2
!3
!4
!5
|-
|1
|Entrance Exam Medley
|1
|100m
|Judo
|25m Rapid Fire Pistol
| - 
| - 
|Default
|-
|2
|Stylus Intro Medley
|1
|20km Race Walk
|Horizontal Bar
|100m Backstroke
| - 
| - 
|Default
|-
|3
|Movement Intro Medley
|1
|Balance Beam
|background=yellow|Basketball
|Double Trap
| - 
| - 
|Default
|-
|4
|Graduation Exam Medley
|1
|1000m Kayak (Singles)
|Long Jump
|BMX
|Hammer Throw
|100m Freestyle
|Complete Entrance Exam Medley
|-
|5
|Rock That Rhythm Medley
|1
|Floor
|100m Breastroke
|20km Race Walk
| - 
| - 
|Default
|-
|6
|Unblinking Eye Medley
|1
|Double Trap
|background=yellow|Handball
|25m Rapid Fire Pistol
| - 
| - 
|Default
|-
|7
|Perfect Timing Medley
|1
|3000m Steeplechase
|Weightlifting
|Hammer Throw
|Trampoline
|Triple Jump
|Default
|-
|8
|Cat-like Reflex Medley
|1
|Judo
|background=yellow|Marathon
|Fencing - Epée
|background=yellow|Handball
|Wrestling - Freestyle
|Default
|-
|9
|Sports IQ Medley
|1
|Badminton (Singles)
|110m Hurdles
|1500m
| - 
| - 
|Default
|-
|10
|Strategy Master Medley
|1
|Sprint
|10km Marathon Swim
|Tennis (Singles)
| - 
| - 
|Complete Rock That Rhythm Medley, Unblinking Eye Medley, Perfect Timing Medley, Cat-like Reflex Medley, and Sports IQ Medley
|-
|11
|Artistic Shapes Medley
|1
|100m Backstroke
|Balance Beam
|Javelin Throw
| - 
| - 
|Complete Rock That Rhythm Medley, Unblinking Eye Medley, Perfect Timing Medley, Cat-like Reflex Medley, and Sports IQ Medley
|-
|12
|Keep On Keeping On Medley
|1
|100m Freestyle
|background=yellow|Keirin
|1000m Kayak (Singles)
| - 
| - 
|Complete Rock That Rhythm Medley, Unblinking Eye Medley, Perfect Timing Medley, Cat-like Reflex Medley, and Sports IQ Medley
|-
|13
|Adapt to Survive Medley
|1
|Modern Pentathlon
|10km Marathon  Swim
|1500m
|Triathlon
|Archery (Individual)
|Complete Rock That Rhythm Medley, Unblinking Eye Medley, Perfect Timing Medley, Cat-like Reflex Medley, and Sports IQ Medley
|-
|14
|Laser Focus Medley
|1
|100m
|background=yellow|Basketball
|Weightlifting
|background=yellow|Marathon
|Horizontal Bar
|Complete Strategy Master Medley, Artistic Shapes Medley, Keep On Keeping On Medley, and Adapt to Survive Medley
|-
|15
|Snap Judgments Medley
|1
|Taekwondo
|Badminton (Singles)
|Omnium
| - 
| - 
|Complete Strategy Master Medley, Artistic Shapes Medley, Keep On Keeping On Medley, and Adapt to Survive Medley
|-
|16
|Playing Chicken Medley
|1
|Boxing
|Rings
|Pole Vault
|Horizontal Bar
|Weightlifting
|Complete Strategy Master Medley, Artistic Shapes Medley, Keep On Keeping On Medley, and Adapt to Survive Medley
|-
|17
|Belt It Out Medley
|1
|100m Breaststroke
|Weightlifting
|Shot Put
| - 
| - 
|Complete Strategy Master Medley, Artistic Shapes Medley, Keep On Keeping On Medley, and Adapt to Survive Medley
|-
|18
|De-Stress Medley
|1
|Hammer Throw
|1000m Kayak (Singles)
|BMX
|background=yellow|Football
|background=yellow|Keirin
|Complete Laser Focus Medley, Snap Judgments Medley, Playing Chicken Medley, and Belt It Out Medley
|-
|19
|Quickie Medley
|1
|Weightlifting
|background=yellow|Marathon
|100m
| - 
| - 
|Complete Laser Focus Medley, Snap Judgments Medley, Playing Chicken Medley, and Belt It Out Medley
|-
|20
|Record-Setter Medley
|1
|Badminton (Singles)
|Double Trap
|Modern Pentathlon
| - 
| - 
|Complete Laser Focus Medley, Snap Judgments Medley, Playing Chicken Medley, and Belt It Out Medley
|-
|21
|2P Affinity Medley 1
|2
|Canoe Slalom (Pair)
|Water Polo
|Badminton (Doubles)
| - 
| - 
|Default
|-
|22
|2P Affinity Medley 2
|2
|Platform Diving (Synchronised)
|Sailing - 470 (Pair)
|Hockey
| - 
| - 
|Complete 2P Affinity Medley 1
|-
|23
|2P Co-op Medley 3
|2
|Beach Volleyball
|Table Tennis (Doubles)
|Synchronised Swimming (Duet)
| - 
| - 
|Complete 2P Affinity Medley 2
|-
|24
|4P Co-op Rhythm Medley 1
|4
|Rhythmic Ribbon (Team)
|Rowing - Quadruple Sculls
|Synchronised Swimming (Team)
| - 
| - 
|Default
|-
|25
|4P Bonding Medley 2
|4
|Show Jumping (Team)
|Archery (Team)
|4x100m Relay
| - 
| - 
|Complete 4P Co-op Rhythm Medley 1
|}
{{br}}

=====Party Mix=====
{{image|more=yes|section=yes|A screenshot of a Party News event}}
Party Mix medleys function differently to other medley types, as while there are three different individual medleys, all of them use a randomized selection of single character events. All three Party Mix medleys are available at the start of the game, with the only differences being the number of events in each and the amount of points awarded for the Party Mix Awards event.  The main difference to Party Mix medleys is the addition of Party News events, which are various randomly occurring events in the form of a news broadcast hosted by Omochao that appear at various times in the medley and often award players bonus points. The Party News events that can occur are:
*Event Selection: A randomly selected human player chooses between four event types, including Timing games, Microphone games, Judgment games, Finesse games, Rhythm games, Flexibility games, Do-or-Die games, Wrist workout games, Repetition games, Balance games, and Intelligence games. An event is selected from the player's chosen category and played as the next event. During this Party News event, a picture is taken of the player choosing the event and is used to announce the chosen Olympic event. 
*Captain Drake's lost treasure: The lost treasure of {{wp|Francis Drake|Captain Drake}} is found, and players take it in turn to select a random chest that includes a number of bonus points. The number of points varies between players to even the scores such that players in lower positions will receive more points than those in higher positions, and the other players will be able to see how many points are in the choosing player's chests.
*Bonus Update!: Announces all of the player's current ranks and the upcoming bonus events before they are played.
*Party Mix Awards!: Handed out at the end of each medley, awarding players points for the most and least points earned in a certain event class, 10 and 15 points respectively for Party Mix 10 Medley in one class, 15 and 20 for Party Mix 15 Medley in two classes and 20 and 25 for Party Mix 20 Medley in two classes. This Party News event also makes use of the camera when revealing players that won awards and before announcing the final results, with computers receiving one of a number of images to represent them.

=====Custom=====
Custom Medleys consist of medleys that the player has made using the Make an Event Medley mode or traded with another player using the Trade an Event Medley function. The player can create up to twenty medleys, with the options of making medleys with five single character events or three two or four-character team events. The player can store up to twenty medleys across all types, and is also able to name their medley. Custom medleys have a rarity rating, which is rated from 1 to 10 stars, which is based on both the average of each event's Best Event Ranking from 1 to 57, and a "hidden value" that takes the ratio of the average score of the events in the medley to the average score of all 57 events in the game. An event's Best Event Ranking is determined by three attributes:
*'''Frequency''': Determined by how many times the player has played the event. In the Play Data section of the Record Log, the player can check which 5 events the player has played the most.
*'''Difficulty''': The average level of COM opponents that the player competes against in the event. This attribute will change even if the player cannot compete against a COM player or team because of the number of players or the selected event.
*'''Performance''': The average finishing position of the player in the event.
The three attributes determines a score for the event used to determine the Best Event ranking, which is shown to the player while making their medley. By picking events with a lower number ranking (the lower this number, the better the player is at an event), the rarity rating for the event will increase. The ranking does not take into account events being in other classes though, meaning that if a player's top events are distributed over single character, double character and quadruple character events, the maximum rarity rating of ten cannot be obtained unless the player changes their top ranked events by repeatedly playing and winning the events in either Highlight Match, Medley Match, or Story Mode. A "hidden value" is also another factor of determining the rarity rating, which is the ratio of the average score of the events in the medley to the average score of all 57 events in the game. When a player plays an event, this "hidden value" will increase very rapidly for medleys containing the event, and decrease very slowly for medleys not containing the event. This "hidden value" will have an effect on the rarity rating given to a medley containing certain events.

When playing multiplayer, the medleys available in the Custom list are based off medleys in the host's list, and only the host can win badges for winning a medley with a certain rarity rating. The rarity of the medley does not change once a medley is created and the player must recreate the medley to determine if the rarity rating has changed. The COM Level that the player competes against in a custom medley does not affect whether a badge will be won for winning a custom medley with a specific rarity rating.

====Multiplayer====
The Nintendo 3DS version of ''Mario & Sonic at the London 2012 Olympic Games'' offers both local and download play multiplayer for up to four players. Download play gives the players the option to compete in both highlight match and event medleys, controlled by the host. During this mode, after completing an event, the usual option to quit is replaced with the option to disconnect the other players.

In Local Play, both Highlight Match and Medley Match are played as normal, although with only the host being able to make selections. All records, including those set by a team, can be saved in Local Play.

In Download Play, the player can play Highlight Match, in which only the host player can select the events, or Medley Match, in which only a "Party Mix Demo DL Medley" is available, in which all players play all of the events as different colors of [[Yoshi (species)|Yoshi]]. Download play also features some technical restrictions, including character sound effects being removed and some music being changed, certain features being removed, the top screen becoming inactive at some points, and data such as records not being saved.

The way that teams are set up in multiplayer also changes depending on the number of characters playing, taking advantage of the number of players to allow events to be played in different ways. To accommodate for this, certain events make use of control changes to allow for more of the players to be playing simultaneously. When two players are using the mode, they will automatically be taken to the final in tournament based events, and will always be paired up against COM characters in 2-character events. For three or more players, the host sets the teams, with a COM being used to fill in an extra member if required. For events that make use of a four character team, the set up of the players will also vary. If four players are connected, then each selects a character and the team order runs with the player numbers. For some events, if there is an incomplete team of human players, COMs can be used to fill the remaining team slots. However in events where this is not possible, certain players will take multiple characters. With two players, each player selects two characters each and alternates control throughout the event, and with three characters, player 1 will also take control of the fourth character.

===Story Mode===
In the Story Mode, players play through a story split into several episodes. Each episode consists of an opening and closing cutscene, with a number of challenges that must be completed in between them to unlock the next part of the story. The cutscenes can be skipped using the start button, and also feature dialogue which the player can page through by pressing the A Button. The first cutscene usually sets up the challenges, occasionally mentioning specific events that the player will play. Each episode can have up to seven challenges, which are either single events or medleys of three or five events. The events featured will often be adjusted for the mode, sometimes featuring fewer specific and occasionally exclusive opponents, with medley challenges working the same way as in medley mode, though occasionally with adjusted point values based on the number of opponents. Not every challenge is required to be completed for every episode, as episodes with multiple challenges will sometimes specify a smaller number of challenges that need to be completed in order to progress, and the player can complete any of the available challenges to fill this quota. The difficulty of the opponents gradually increase throughout the Story Mode, with the opponents being easy difficulty up to A Rainbow In Fog, where the first set of normal opponents appear. Normal opponents appear up until the end of the main story, and hard opponents then appear in all of the bonus episodes.

When first starting the mode, The Night Before cutscene is the first episode unlocked, and must be watched to unlock the first pair of episodes with challenges, Stadium Blues and Sonic Arrives. Completing each episode unlocks another initially, with the Mario episodes leading into the Girls ones, and the Sonic ones leading into Challengers. Once both The Mysterious Thief and Enter Bowser?! are completed, Mario and Sonic is unlocked, and completing this episode then unlocks The Secret of the Fog. After completing the Secret of the Fog, Waluigi's Ambition, Wario's Scheme, The Banana Incident and Corner the Koopa King! are all unlocked. Waluigi's Ambition and Wario's Scheme must both be completed to unlock Stop Dr. Eggman!, and completing it along with The Banana Incident and Corner the Koopa King! unlocks the Clear Skies Again cutscene. After watching this, each episode is unlocked sequentially until the completion of Junior Triumphant!, which unlocks both Bowser's Blues and Dr. Eggman's Robots. Both the Wild Ones Bonus Story and Tricksters Bonus story must be completed in their entirety to unlock the Girls Bonus episodes, with Mario's Defeat?! and The Fog Returns' completion unlocking An Innocent Request. The final two episodes are then unlocked sequentially.

The mode also offers players a Clear Assist option, which allows them to complete a challenge in the episode after failing it enough times. This allows the player to progress through the story, but will mark the episodes cleared in this way with a gray banner until challenges that the player used Clear Assist on are properly completed by the player. Even if the player completes the required number of episodes for the challenge without Clear Assist, if one or more challenges is finished with the Clear Assist the episode will be marked with a gray banner. Episodes that have optional challenges will marked as cleared with a white banner if not all of the challenges have been completed, and episodes where every challenge has been completed regardless of whether it was compulsory will be marked as clear with a gold banner.
====Main Episodes====
{{image|more=yes|section=yes|A screenshot for Clear Skies Again}}
{|class="wikitable"
!rowspan=2|Episode
!rowspan=2|Image
!rowspan=2|Entry Characters
!rowspan=2|Locations
!rowspan=2|Plot summary
!colspan=3|Challenge
|-
!Events
!Characters
!Opponents
|-
|The Night Before
|[[File:M&S 2012 The Night Before.jpg|150px]]
| - 
|Big Ben, Main Stadium
|Bowser and Dr. Eggman release the Phantasmal Fog as revenge for not being invited to the Olympic Games. The Toads and Omochao setting up at the Main Stadium are scared off by the fog, and Toad encounters a pair of imposters. 
| - 
| - 
| - 
|-
|[[Stadium Blues]]
|[[File:M&S 2012 Stadium Blues.png|150px]]
|Heroes
|Main Stadium
|Mario, Luigi and Toad find the Main Stadium filled with Phantasmal Fog, and investigate the cause of it. After defeating some imposters, the group is joined by Omochao and they head to where the fog is thickest.
|100m, Pole Vault
|Mario, Luigi
|Fake Sonic, Fake Tails
|-
|[[Foggy Foes]]
|[[File:M&S 2012 Foggy Foes.png|150px]]
|Heroes
|Main Stadium
|Toad and Omochao find Dry Bones and Dry Bowser at the Main Stadium, and Mario and Luigi defeat them. Mario and Luigi find and destroy a fog machine, clearing the fog from the area and causing Dry Bones and Dry Bowser to leave. Noticing fog over Hyde Park, they head there with Toad.
|Sailing - 470 (Pair)
|Mario, Luigi
|Dry Bones, Dry Bowser
|-
|[[Morning in Hyde Park]]
|[[File:M&S 2012 Morning in Hyde Park.png|150px]]
|Girls
|Hyde Park
|Daisy and Amy find Phantasmal Fog in Hyde Park, and come across some imposters. After initially defeating the imposters and making them disappear, Daisy and Amy are attacked by a larger group.
|Beach Volleyball, Canoe Slalom (Pair)
|Daisy, Amy
|Fake Peach, Fake Blaze
|-
|[[Peach in a Pinch]]
|[[File:M&S 2012 Peach in a Pinch.png|150px]]
|Girls
|Hyde Park
|Peach and Blaze try to protect a group of Toads from some imposters, and eventually succeed, causing them to disappear. The group find Daisy and Amy, who explain what happened to them, and the purple Toad suggests that they look for Rouge.
|100m Backstroke, Archery (Individual), Omnium, Balance Beam, Keirin
|Peach, Blaze
|Fake Peach, Fake Blaze
|-
|[[The Mysterious Thief]]
|[[File:M&S 2012 The Mysterious Thief.jpg|150px]]
|Girls
|Hyde Park
|The group find Rouge, who explains her plan with the fog. Peach challenges her and wins, revealing the Rouge had been brainwashed. She leads them to a fog machine, which Blaze destroys and clears the fog from the park. Mario, Luigi, and Toad arrive, and Rouge remembers seeing Dr. Eggman at the British Museum. Mario, Luigi, and Toad head there to investigate.
|100m Backstroke
|Peach
|Rouge
|-
|[[Sonic Arrives]]
|[[File:M&S 2012 Sonic Arrives.jpg|150px]]
|Heroes
|Tower of London
|Sonic and Tails find the Phantasmal Fog at the Tower of London, and defeat a pair of imposters that appear. The pair follow a Boo that seems to know about the fog.
|Judo, Fencing - Epée
|Sonic, Tails
|Fake Mario, Fake Luigi
|-
|[[The Ghostly Tower]]
|[[File:M&S 2012 The Ghostly Tower.png|150px]]
|Heroes
|Tower of London
|Sonic and Tails overhear part of a conversation between King Boo and the Boo about the fog, and defeat them in an event. The Boos flee, though lead Sonic and Tails to the Fog machine, which Sonic destroys and clears the fog from the area. The pair leave to get some rest.
|Badminton (Doubles)
|Sonic, Tails
|King Boo, Boo
|-
|[[The Blocked Bridge]]
|[[File:M&S 2012 The Blocked Bridge.png|150px]]
|Challengers
|Tower Bridge
|Sonic, Tails, and Yoshi find more fog at Tower Bridge, which is causing the bridge to stay up. Yoshi defeats imposters of Shadow and Silver, and the real Shadow and Silver arrive. The group discuss the fog, then chase Jet when he flies past.
|110m Hurdles, 1500m, 10km Marathon Swim, Trampoline
|Yoshi
|Fake Shadow, Fake Silver
|-
|[[The Wind Master]]
|[[File:M&S 2012 The Wind Master.png|150px]]
|Challengers
|Tower Bridge
|The group corner Jet and ask him about the fog, before Shadow defeats him in an event. Jet then finds and fails to destroy the machine, and the group hear some laughter.
|3000m Steeplechase
|Shadow
|Jet
|-
|[[Enter Bowser?!]]
|[[File:M&S 2012 Enter Bowser.png|150px]]
|Challengers
|Tower Bridge
|The group finds Bowser Jr. and ask him about the fog, before challenging him. After he is defeated, he reveals that Bowser and Dr. Eggman are behind it before escaping. Yoshi chases after Bowser Jr., and the rest of the group split up, with Jet suggesting that Sonic and Tails head to the British Museum. The pair agree and head there.
|Triple Jump, 10km Marathon Swim, 3000m Steeplechase, Trampoline, Basketball, Floor, 110m Hurdles, 1500m
|Yoshi, Shadow, Silver
|Bowser Jr.
|-
|[[Mario and Sonic (episode)|Mario and Sonic]]
|[[File:M&S 2012 Mario and Sonic.jpg|150px]]
|Heroes
|British Museum
|Mario, Luigi, Toad, Sonic, and Tails find each other at the British Museum. After sharing some information about the Phantasmal Fog, they defeat some more imposters and head into the museum's courtyard to investigate further.
|100m Freestyle, BMX, Sprint, Pole Vault, Fencing - Epée, 100m, Judo, Marathon
|Mario, Luigi, Sonic, Tails
|Fake Mario, Fake Luigi, Fake Sonic, Fake Tails
|-
|[[The Secret of the Fog]]
|[[File:M&S 2012 The Secret of the Fog.jpg|150px]]
|Heroes
|British Museum
|The group find and defeat Eggman Nega in the courtyard, before locating and destroying the fog machine, clearing the fog from the museum. They head inside, and Tails finds out more about the fog. Espio and Charmy arrive and split the group up to four separate locations around London to stop Bowser and Dr. Eggman's minions causing trouble.
|4x100m Relay
|Mario, Luigi, Sonic, Tails
|Eggman Nega, blue Shy Guy
|-
|[[Waluigi's Ambition]]
|[[File:M&S 2012 Waluigis Ambition.png|150px]]
|Tricksters
|London Tennis Club
|Waluigi tests out some binoculars, and scares away some Shy Guys. Metal Sonic breaks the binoculars and Waluigi challenges him as Luigi and Charmy arrive. Waluigi wins and Metal Sonic escapes, and is chased by Waluigi. Luigi and Charmy follow them.
|1000m Kayak (Singles), Handball, 100m Breastroke, Badminton (Singles), Taekwondo
|Waluigi
|Metal Sonic
|-
|[[Wario's Scheme]]
|[[File:M&S 2012 Warios Scheme.png|150px]]
|Tricksters
|Eton Dorney
|Wario tries to set up a snack stand, and decides to break the fog machine and clear the area to improve business. Dr. Eggman tries to stop him by challenging him, though Wario wins and tries to break the machine, though it turns out to be a hologram. Dr. Eggman escapes, and Mario and Toad arrive and try to speak to Wario, though he runs after Dr. Eggman, and Mario and Toad follow him.
|Long Jump, 100m Kayak (Singles), Handball, 25m Rapid Fire Pistol, Taekwondo
|Wario
|Dr. Eggman
|-
|[[Stop Dr. Eggman!]]
|[[File:M&S 2012 Stop Dr Eggman.png|150px]]
|Tricksters
|Eton Dorney
|Wario and Waluigi find each other, and set off after Dr. Eggman and Metal Sonic. They challenge the pair hoping for compensation and win. Waluigi then distracts the pair as Wario destroys the fog machine, clearing the area. Mario, Luigi, Toad, and Charmy decide to let Wario and Waluigi take care of Dr. Eggman and Metal Sonic and head back to the Main Stadium.
|Hockey, Platform Diving (Synchronised)
|Wario, Waluigi
|Dr. Eggman, Metal Sonic
|-
|[[The Banana Incident]]
|[[File:M&S 2012 The Banana Incident.png|150px]]
|Wild Ones
|ExCeL London
|Tails and Espio try to stop Omega rampaging, and Omega ends up runing Donkey Kong's banana. Donkey Kong defeats him in an event, knocking a chip out of him, and sends him to stop Dr. Eggman with Tails and Espio.
|Wrestling - Freestyle
|Donkey Kong
|Omega
|-
|[[Corner the Koopa King!]]
|[[File:M&S 2012 Corner the Koopa King.png|150px]]
|Wild Ones
|Horse Guards Parade
|Sonic arrives at Horse Guards Parade and is attacked by Bowser, who Knuckles and Vector try to stop. Thy defeat him in an event, and Knuckles destroys the fog machine and clears the fog from the area. He stays with Vector to interrogate Bowser while Sonic heads to the Main Stadium
|Hammer Throw, Football, Javelin Throw, Tennis (Singles), Boxing, Weightlifting, Rings, Double Trap
|Knuckles, Vector
|Bowser
|-
|Clear Skies Again
|
| - 
|Main Stadium, Horse Guards Parade, Eton Dorney, Big Ben
|The separate groups arrive back at the Main Stadium together and catch each other up, before getting ready to set up for the opening ceremony. The Bowser and Dr. Eggman that had been faced earlier are revealed to be holograms, and Dr. Eggman creates some more powerful fog to cover the city again.
| - 
| - 
| - 
|-
|[[A Rainbow In Fog]]
|[[File:M&S 2012 A Rainbow In Fog.png|150px]]
|Heroes
|Main Stadium
|The groups combine again as the stadium is covered in fog, which scares away the spectators. They save Cream and Cheese from some imposters by defeating them, and then decide to head to Stonehenge.
|Modern Pentathlon, 20km Race Walk, Triathlon, Horizontal Bar, 100m Freestyle, Sprint, Table Tennis (Doubles)
|Mario, Luigi, Sonic, Tails
|Fake Mario, Fake Luigi, Fake Sonic, Fake Tails
|-
|[[To the Ruins!]]
|[[File:M&S 2012 To the Ruins.png|150px]]
|Heroes
|Stonehenge
|Mario, Luigi, Toad, Sonic, Tails, and Omega arrive at Stonehenge, and question Magikoopa, defeating it in an event. Magikoopa hit Omega into Big with its magic, causing Omega to remember more about the fog and where Bowser and Dr. Eggman are hiding. The collect the lid for the fog urn and head to Big Ben.
|BMX
|Sonic
|Magikoopa
|-
|[[The Promise to Toad]]
|[[File:M&S 2012 The Promise to Toad.png|150px]]
|Heroes
|Big Ben
|The group arrive outside Big Ben and defeat a group of imposters. Toad and Omega head back to the Main Stadium, while Mario, Luigi, Sonic, and Tails into Big Ben to face Bowser and Dr. Eggman.
|100m, Marathon, 100m Freestyle, Modern Pentathlon, 20km Race Walk, Triathlon, Fencing - Epée, Table Tennis (Doubles), Sailing - 470 (Pair), Badminton (Doubles)
|Mario, Luigi, Sonic, Tails
|Fake Mario, Fake Luigi, Fake Sonic, Fake Tails
|-
|[[The Grand Showdown]]
|[[File:M&S 2012 The Grand Showdown.png|150px]]
|Heroes
|Big Ben, Main Stadium, Hyde Park, Eton Dorney, Tower Bridge, Horse Guards Parade
|The Heroes arrive at the top of Big Ben, and find Bowser and Dr. Eggman powered up by the Phantasmal Fog. The other characters call them to tell them that they have cleared the fog up from around London, and Mario and Sonic defeat Bowser and Dr. Eggman. Mario and Sonic stop the Phantasmal Fog, and Bowser and Dr. Eggman explain that they created the fog because they did not receive their invitations. Toad invites them to join the games, and they head back to the Main Stadium for the opening ceremony.
|Sprint, 20km Race Walk, Judo, 100m
|Mario, Sonic
|Phantasmal Fog-powered Bowser, Phantasmal Fog-powered Dr. Eggman
|}
{{br}}

====Bonus Episodes====
{|class="wikitable"
!rowspan=2|Episode
!rowspan=2|Image
!rowspan=2|Entry Characters
!rowspan=2|Locations
!rowspan=2|Plot summary
!colspan=3|Challenge
|-
!Events
!Characters
!Opponents
|-
|[[Junior Hits England]]
|[[File:M&S 2012 Junior Hits England.png|150px]]
|Challengers
|Stonehenge
|Bowser Jr. mistakenly arrives at Stonehenge instead of London, and is encouraged by some Shy Guys to challenge Yoshi. After beating Yoshi, Bowser Jr. asks everyone to tell Bowser how well he did, and heads to London to defeat some of Dr. Eggman's robots.
|Floor, Trampoline, Triple Jump
|Bowser Jr.
|Yoshi
|-
|[[Junior, Super Hero?]]
|[[File:M&S 2012 Junior Super Hero.png|150px]]
|Challengers
|Tower Bridge
|Bowser Jr. accidentally saves Omochao and a Chao from an Egg Pawn and Egg Flapper, impressing Shadow and Silver. Bowser Jr. defeats them in an event, and they leave wishing Bowser Jr. luck. Goomba suggests that Bowser Jr. should defeat another robot to impress Bowser.
|1500m, 3000m Steeplechase, Shot Put, 10km Marathon Swim
|Bowser Jr.
|Shadow, Silver
|-
|[[Junior Triumphant!]]
|[[File:M&S 2012 Junior Triumphant.png|150px]]
|Challengers
|Main Stadium
|Bowser Jr. and Goomba find Dr. Eggman and Metal Sonic training at the Main Stadium, and challenges Metal Sonic despite Dr. Eggman's consequences. Bowser Jr. wins, and after Dr. Eggman tries to trick him asks for a snack and him to tell Bowser how well he did.
|110m Hurdles
|Bowser Jr.
|Metal Sonic
|-
|[[Bowser's Blues]]
|[[File:M&S 2012 Bowsers Blues.png|150px]]
|Wild Ones
|Tower of London, Main Stadium
|Lakitu, Goomba and Magikoopa notice Bowser is particularly angry after giving him a bad tour of London, and decide to cheer him up by helping him win some events. The next day, Magikoopa tricks Donkey Kong using some Bananas and a Thwomp, and Bowser defeats him. Goomba then takes him to his next challenge.
|Wrestling - Freestyle, Hammer Throw, Double Trap, Rings
|Bowser
|Donkey Kong
|-
|[[The Life of a Minion]]
|[[File:M&S 2012 The Life of a Minion.png|150px]]
|Wild Ones
|ExCeL London
|Lakitu and Dry Bones have Magikoopa transform them to look like Espio and Charmy to trick Knuckles and Vector into a competition with Bowser. Bowser defeats them, angering Knuckles and Vector, and Goomba takes Bowser to his next challenge.
|Hammer Throw, Javelin Throw, Football, Boxing, Wrestling - Freestyle, Double Trap, Weightlifting, Rings
|Bowser
|Knuckles, Vector
|-
|[[Mario's Defeat?!]]
|[[File:M&S 2012 Marios Defeat.png|150px]]
|Wild Ones
|London Tennis Club
|Magikoopa transforms Goomba to look like Mario for a match for Bowser, which Bowser wins. Bowser Jr. arrives having seen Bowser's victory, cheering up Bowser, who had a toothache, as well as the minions.
|Tennis (Singles)
|Bowser
|Goomba disguised as "Mario"
|-
|[[Dr. Eggman's Robots]]
|[[File:M&S 2012 Dr Eggmans Robots.png|150px]]
|Tricksters
|Big Ben
|After Orbot and Cubot accuse Dr. Eggman of programming Metal Sonic so that he will lose to him, Dr. Eggman sets up a match between Metal Sonic and Waluigi. Metal Sonic wins the match, and Dr. Eggman returns to the lab to work on him some more.
|100m Breaststroke, Badminton (Singles), 1000m Kayak (Singles), 25m Rapid Fire Pistol
|Metal Sonic
|Waluigi
|-
|[[An Old Urn]]
|[[File:M&S 2012 An Old Urn.png|150px]]
|Tricksters
|Big Ben
|Dr. Eggman sets up a match between Metal Sonic and Wario, offering Orbot and Cubot to Wario as a prize. Metal Sonic wins, and Wario gives Dr. Eggman the fog urn, which he takes back to the lab to inspect.
|100m Breaststroke, Handball, Badminton (Singles)
|Metal Sonic
|Wario
|-
|[[The Fog Returns]]
|[[File:M&S 2012 The Fog Returns.png|150px]]
|Tricksters
|Big Ben
|Dr. Eggman successfully opens the fog urn and releases the Phantasmal Fog, and challenges the imposter that it produces. After winning, he explains the history and function of the fog to Orbot, Cubot and Metal Sonic.
|Taekwondo
|Dr. Eggman
|Fake Sonic
|-
|[[An Innocent Request]]
|[[File:M&S 2012 An Innocent Request.png|150px]]
|Girls
|Hyde Park
|Peach, Amy, Blaze, and the Toads work on preparing the invitations for the Olympic Games, and Amy challenges Blaze to be able to deliver Sonic's invitation by hand. Amy wins the challenge, but decides to help when Blaze accidentally knocks the invitations off the table, and rewrites the invitation for Dr. Eggman when it is ruined.
|Archery (Individual), Keirin, Omnium
|Amy
|Blaze
|-
|[[A Trick of the Wind]]
|[[File:M&S 2012 A Trick of the Wind.jpg|150px]]
|Girls
|Hyde Park
|Daisy arrives as the invitations are being finished, and offers to take Amy shopping with her. Blaze and Peach beat them in an event so that they stay behind to help, though when the group take a break the wind scatters the invitations. Peach and Amy rewrite Bowser and Dr. Eggman's ruined invitations.
|Balance Beam, Archery (Individual), Canoe Slalom (Pair)
|Peach, Blaze
|Daisy, Amy
|-
|[[The Real Beginning]]
|[[File:M&S 2012 The Real Beginning.png|150px]]
|Girls
|Hyde Park
|Bowser and Dr. Eggman arrive in Hyde Park to collect their late invitations, though Peach and Amy challenge them to stop them. Peach and Amy win, but get Bowser and Dr. Eggman their invitations anyway. Bowser and Dr. Eggman find their invitations after two Toads drop them, but assume that they are love letters and were what caused the delay and leave. The group find that Bowser and Dr. Eggman have gone, assuming they found their invitations, and head off shopping.
|Beach Volleyball
|Peach, Amy
|Bowser, Dr. Eggman
|}
{{br}}

===Record Log===
====Play Data====
In this mode, the player can view data based on their gameplay. 
=====View Play Data=====
In the View Play Data option, the player can see their records for the forty events in the game that allow for records to be recorded, as well as the characters used to obtain the records. If both files have play data the, player is able to compare the records of the first and second file in this mode. 

=====Play Data Top 5's=====
In the Play Data Top 5's{{sic}}, the player can view the top 5 for Best Event, Best Controls, Most Played and Best Genre for the file. The Best Event shows the events that have the highest in-game ranking as used to calculate the rarity of event medleys, the Best Controls details the control scheme in which the player performs the best, the Most Played lists the events that the player has competed in the most frequently, and the Best Genre is the type of game that the player performs the best in. The mode also displays the player's current play time for the file.

====Collection====
In the Collection, the player can earn and view several types of the game's collectibles. 
=====Medal Collection=====
The player can view their medal collection, which shows an overview of the medals achieved for each event based on their best medal earned on the highest game level. For example, if the player has earned a bronze medal for the normal difficulty, but a gold medal for the easy difficulty, then the bronze medal will be displayed rather than the gold one. However, if no medals have been earned for the higher difficulty rating, then the best medal for the difficulty below is displayed instead- so if a silver medal has been earned on the normal difficulty, but no medal has been earned for the hard difficulty, then the silver medal will be displayed. If no medals have been earned for an event yet, then the medal case for that event appears empty. Each medal is accompanied by an image for the type of sport for which it was obtained, and can be selected to view the medals earned at all game levels in the event.

=====Badge Machine=====
In this mode, the player can use tickets earned in-game for competing in events and playing various events to spin the badge machine and collect various badges in the game. The number of tickets that the player has earned is only shown when viewing the machine and are given no indication that they are earned when playing in other modes. A maximum of 999 tickets can be held at once. A badge can be earned by using the stylus to spin the handle onscreen, or by pressing the A Button. 160 different badges can be obtained from the machine, distributed across three different rarities- there are 100 common badges of various objects that come in blue capsules, 40 uncommon badges that come in yellow capsules of minor Mario and Sonic characters, plus six of the London 2012 Olympic mascot Wenlock, and then 20 rare badges of the athlete characters that come in pink capsules. Badges with higher rarities have a higher background, with the rare badges appearing with an exclusive square shape. Each badge can be collected multiple times, with the number obtained also recorded. The player can also press the Y Button as a shortcut to their badge collection.

=====View Badges=====
{{Main|List of badges in Mario & Sonic at the London 2012 Olympic Games (Nintendo 3DS)}}
In this mode, the player can view the badges that they have collected from the badge machine, as well as another forty that can only be unlocked for completing in-game criteria. Of this forty, 20 are treated as the rare square badges, and the other 20 are uncommon. Each of these badges can only be earned once. The badges are grouped into pages based on their rarity and designs. The player can also set any badge that they have earned to appear on their profile in this mode by either touching the badge or pressing the A button when it is selected. The player can press the Y Button in this mode as a shortcut to the badge machine, as well as being able to view their current number of tickets.

====Online Rankings====
In this mode, the player can compare their rankings in the 23 single character events that have non-integer records to other players around the world via the internet. The player can upload and update their own records in the mode. The player will be able to see their own ranking in the global leaderboards, as well as that of the four players directly above them and the five directly below, the overall top ten in the world and their ranking compared to any friends that have the game. For each record, the player can view the player's rank, set flag, profile star rating and title, file name, badge, character used to obtain the record and the record itself. When entering the mode, the player is also given an indication of any events that they have improved their record on since last updating their position in the rankings.

===Profile rankings===
''Mario & Sonic at the London 2012 Olympic Games'' features a ranking system for each of the profiles in the game, based on the completion of the save file. Progress for various modes in the game, including medals earned, badges collected, and Story Mode episodes completed, which give the player a star ranking from 0 to 5. Each ranking can be accompanied by a number of different titles, which can change without the player going up a rank and can be affected by the events that the player plays most frequently. The following titles are available for each rank:
*0 Stars - Anonymedalist
*1 Star - 1500m Snail, Baby Steps, Ball Pusher, Beam Crawler, Early Oarsman, Hammer Chucker, Hurdle Newbie, Javelin Chucker, Kayak Starter, Leapfrog Jumper, Lethargic Start, Man of Lead, Marathon Minnow, Page, Pebble Fist, Rookie Rider, Shaky Passer, Shallow Breather, Shooter, Sloppy Crawl, Smooth Strider, Snake Foot, Stopped Watch, Tin Wrestler, Wall Crasher, Wannabe Dancer, Whisperer, White Belt
*2 Stars - 1500m Tortoise, Backstroke Novice, Backup Dancer, Blocker, Breeze, Brown Belt, Center Shooter, Clear-Sighted, Cricket, Dry Spell, Gas Engine, Hammer Slinger, Humdrum Horseman, Hunter, Hurdle Novice, Javelin Tosser, Jet Engine, Lively Start, Man of Zinc, Mantis Foot, Rooftop Jumper, Rusty Clock, Smooth Strider, So-So Crawl, So-So Passer, Solid Hands, Solid Lander, Solid Striker, Speaker, Squire,  Steady Breather, Triple Skipper
*3 Stars - 1500m Hare, Backstroke Pro, Beam Strider, Black Belt, Bumper, Cloud Jumper, Elegant Oarsman, Frog, Gorilla Grip, Hurdle Hopper, Javelin Flinger, Knight, Lead Dancer, Light-Footed Start, Man of Bronze, Modern Count, Monkey Foot, Power Walker, Rehydrator, Seasoned Striker, Shouter, Shuttle Seeker, Smooth Lander, Solid Striker, Solid Vaulter, Steady Crawl, Steady Passer, Superb Passer, Triple Jumper, Trotting Teamster, Vigorous Breather, Wall Jumper, Wind Rider
*4 Stars - Backstroke Artist, Bellower, Expert Oarsman, Hurdle Leaper, Lightning Start, Man of Iron, Marching Master, Pro Lander, Rocket Engine, Sensei, Setter, Shuttle Smasher, Smooth Lander, Star Jumper, Super-Sighted, Templar, Tiger Foot, Triple Leaper, Trusty Clock, Veteran Dancer, Wall Vaulter, Water Whiz
*5 Stars - 1500m Cheetah, Backstroke Master, Bar Conqueror, Beam Ruler, Dragon Foot, Extreme Oarsman, Galaxy Jumper, Golden Ribbon, Grand Master, Grand Slammer, Heavyweight, Herculean Hands, Hurdle Hero, Javelin Launcher, Kangaroo, Light-Speed Start, Lungs of Steel, Man of Steel, Mountain Fist, Second-Sighted, Sonic Crawl, Stellar Passer, Stellar Sync Duo, Stunning Lander, Superb Passer, Superstar Dancer, Triple Launcher, Walking Wizard, Wind Wizard

==Characters==
===Playable characters===
A total of 20 different characters are playable in the various events of the game, using the same roster as the [[Nintendo DS]] version of ''[[Mario & Sonic at the Olympic Winter Games (Nintendo DS)|Mario & Sonic at the Olympic Winter Games]]''. However, unlike prior entries in the series, not every character can be played as in every event; the characters are split into five groups of four members each, and each event can only be competed in by members of a specific group.
====Heroes====
{|border=1 cellspacing=0 cellpadding=3 align=left width=
!bgcolor=#55b9e0 colspan=4|Heroes
|-
|bgcolor=#c1e6f5 align=center width=25%|[[Mario]]<br>[[File:M&SATLOG Mario Badminton artwork.png|x150px]]
|bgcolor=#c1e6f5 align=center width=25%|[[Sonic]]<br>[[File:M&SATLOG Sonic Fencing artwork.png|150px]]
|bgcolor=#c1e6f5 align=center width=25%|[[Luigi]]<br>[[File:M&SATLOG Luigi Relay artwork.png|x150px]]
|bgcolor=#c1e6f5 align=center width=25%|[[Tails]]<br>[[File:M&SATLOG Tails Table Tennis artwork.png|150px]]
|-
|bgcolor=#c1e6f5|''After Mario's many adventures, he is now taking his all-round skills to the London Olympic Games, where his running and jumping experience should come in handy in events like the 100m Sprint and Pole Vault.''
|bgcolor=#c1e6f5|''The fastest hedgehog in the world, this little blue speed demon often gets going so fast, he appears to be just a whirling blur. He'll usually be found out front of any of the Speed-based events in these Olympic Games, and will be very difficult to catch in any of the short-distance sprints.''
|bgcolor=#c1e6f5|''Luigi is Mario's twin brother and the family resemblance is obvious. Like Mario, Luigi is an all-round type of guy, not excelling in any one area but showing solid ability in many events in the London Olympic Games.''
|bgcolor=#c1e6f5|''Sonic's buddy Miles Tails Prower is a fox that can fly, thanks to his bushy tails, he possesses a wide range of Skill-based abilities that will make him formidable in a wide range of events. He can jump and accelerate well, so he will be tough to beat in many races.''
|-
|bgcolor=#55b9e0|Single character events
|bgcolor=#c1e6f5 colspan=3|[[100m (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|100m]] • [[Marathon]] • [[20km Race Walk]] • [[Pole Vault (Mario & Sonic at the London 2012 Olympic Games)|Pole Vault]] • [[100m Freestyle (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|100m Freestyle]] • [[Judo]] • [[Fencing - Epée (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Fencing - Epée]] • [[Horizontal Bar]] • [[Sprint]] • [[BMX (Mario & Sonic at the London 2012 Olympic Games)|BMX]] • [[Triathlon]] • [[Modern Pentathlon]]
|-
|bgcolor=#55b9e0|Two character events
|bgcolor=#c1e6f5 colspan=3|[[Synchronised Swimming (Duet)]] • [[Table Tennis (Doubles)]] • [[Badminton (Doubles)]] • [[Sailing - 470 (Pair)]]
|-
|bgcolor=#55b9e0|Four character events
|bgcolor=#c1e6f5 colspan=3|[[4x100m Relay (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|4x100m Relay]] • [[Rowing - Quadruple Sculls]] • [[Archery (Team)]]
|}
{{br}}

====Challengers====
{|border=1 cellspacing=0 cellpadding=3 align=left width=
|-
!bgcolor=#86dbb9 colspan=4|Challengers
|-
|bgcolor=#d0f5db align=center width=25%|[[Yoshi]]<br>[[File:M&SATLOG Yoshi Hurdles artwork.png|x150px]]
|bgcolor=#d0f5db align=center width=25%|[[Shadow (character)|Shadow]]<br>[[File:M&SATLOG Shadow Basketball artwork.png|x150px]]
|bgcolor=#d0f5db align=center width=25%|[[Bowser Jr.]]<br>[[File:M&SATLOG Bowser Jr Trampoline artwork.png|150px]]
|bgcolor=#d0f5db align=center width=25%|[[Silver]]<br>[[File:M&SATLOG Silver Volleyball artwork.png|x150px]]
|-
|bgcolor=#d0f5db|''Yoshi is Mario's friend living on Yoshi's Island and sometime accompanies Mario and Luigi on their adventures. Yoshi will put forward great effort in the London 2012 Olympic Games with his new abilities.''
|bgcolor=#d0f5db|''Like Sonic, Shadow is an extremely fast hedgehog that can give his more famous blue rival a run for his money in most Speed events. Additionally, his accuracy will help give him a leg up in events like Pistol Shooting and Fencing.''
|bgcolor=#d0f5db|''Bowser Jr. is the son of Bowser, but don't let that fool you. with good balancing and the inherited hidden strength from his father, he's aiming for first place in these Olympic Games.''
|bgcolor=#d0f5db|''Coming from the distant future with telekinetic abilities, expect the unexpected from Silver when this time-travelling hedgehog takes on the London Olympic Games!''
|-
|bgcolor=#86dbb9|Single character events
|bgcolor=#d0f5db colspan=3|[[110m Hurdles (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|110m Hurdles]] • [[1500m]] • [[3000m Steeplechase]] • [[Triple Jump (Mario & Sonic at the London 2012 Olympic Games)|Triple Jump]] • [[Shot Put]] • [[10km Marathon Swim]] • [[Basketball (event)|Basketball]] • [[Floor]] • [[Trampoline (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Trampoline]]
|-
|bgcolor=#86dbb9|Two character events
|bgcolor=#d0f5db colspan=3| [[Water Polo]] 
|}
{{br}}

====Girls====
{|border=1 cellspacing=0 cellpadding=3 align=left width=
|-
!bgcolor=#fc1ea4 colspan=4|Girls
|-
|bgcolor=#ffe0ea align=center width=25%|[[Princess Peach|Peach]]<br>[[File:M&SATLOG Peach Rhythmic Ribbon artwork.png|x150px]]
|bgcolor=#ffe0ea align=center width=25%|[[Amy]]<br>[[File:M&SATLOG Amy Gymnastics artwork.png|x150px]]
|bgcolor=#ffe0ea align=center width=25%|[[Princess Daisy|Daisy]]<br>[[File:M&SATLOG Daisy Volleyball artwork.png|x150px]]
|bgcolor=#ffe0ea align=center width=25%|[[Blaze]]<br>[[File:M&SATLOG Blaze Gymnastics artwork.png|x150px]]
|-
|bgcolor=#ffe0ea|''The Princess of the Mushroom Kingdom, Peach has been kidnapped several times over by the wicked Bowser, but has always recovered with the help of Mario and Luigi. Her excellence in the Skill-based competitions means that she'll perform well in events like Ribbon and Showjumping.''
|bgcolor=#ffe0ea|''Sonic's wanna-be girlfriend presents an all-round set of skills that allow her to achieve success in many different events. She's not the most powerful athlete out there, but she can still surprise most of the competition in a variety of ways.''
|bgcolor=#ffe0ea|''Like Peach, Daisy is a princess and she comes from Sarasaland. Daisy is exceptionally fast and will perform well in all the Speed-based events, but her solid technique also will help her excel in some aquatics and gymnastics competitions.''
|bgcolor=#ffe0ea|''Blaze the Cat, another of Sonic's friends, is an all-round competitor. As her name indicates, she also possesses no small amount of speed and will be a formidable contender in events like the 4x100m Relay.''
|-
|bgcolor=#fc1ea4|Single character events
|bgcolor=#ffe0ea colspan=3|[[100m Backstroke]] • [[Balance Beam]] • [[Omnium]] • [[Keirin]] • [[Archery (Individual)]]
|-
|bgcolor=#fc1ea4|Two character events
|bgcolor=#ffe0ea colspan=3|[[Beach Volleyball (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Beach Volleyball]] • [[Canoe Slalom (Pair)]]
|-
|bgcolor=#fc1ea4|Four character events
|bgcolor=#ffe0ea colspan=3|[[Synchronised Swimming (Team)]] • [[Rhythmic Ribbon (Team)]] • [[Show Jumping (Team)]]
|}
{{br}}

====Wild Ones====
{|border=1 cellspacing=0 cellpadding=3 align=left width=
|-
!bgcolor=#594601 colspan=4|Wild Ones
|-
|bgcolor=#e3d08d align=center width=25%|[[Bowser]]<br>[[File:M&SATLOG Bowser Javelin Throw artwork.png|150px]]
|bgcolor=#e3d08d align=center width=25%|[[Knuckles]]<br>[[File:M&SATLOG Knuckles Football artwork.png|x150px]]
|bgcolor=#e3d08d align=center width=25%|[[Donkey Kong]]<br>[[File:M&SATLOG Donkey Kong Hammer Throw artwork.png|150px]]
|bgcolor=#e3d08d align=center width=25%|[[Vector]]<br>[[File:M&SATLOG Vector Weightlifting artwork.png|150px]]
|-
|bgcolor=#e3d08d|''One of Mario's biggest rivals, Bowser is an extremely strong competitor and will dominate the Power events with his big muscles. His size makes him a formidable opponent in any event that he enters, especially the Hammer Throw and Javelin Throw.''
|bgcolor=#e3d08d|''Knuckles is an echidna that shows exceptional versatility despite his overall strength in Power events. He'll perform best at events like throwing and rowing, but can also provide solid competition in many other competitions that aren't as power-based.''
|bgcolor=#e3d08d|''With both strength and agility, Donkey Kong, a truly powerful competitor, cannot wait to try his unique skills in the London Olympic Games.''
|bgcolor=#e3d08d|''Rough-and-tumble Vector is a crocodile that loves money, which means he wants that Gold Medal more than anything. With incredible Power skills, he'll perform well in the throwing events, and given his unique swimming stroke, can excel in the pool as well.''
|-
|bgcolor=#594601|Single character events
|bgcolor=#e3d08d colspan=3|[[Hammer Throw (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Hammer Throw]] • [[Javelin Throw (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Javelin Throw]] • [[Tennis (Singles)]] • [[Football (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Football]] • [[Boxing (Mario & Sonic at the London 2012 Olympic Games)|Boxing]] • [[Wrestling - Freestyle]] • [[Rings (event)|Rings]] • [[Double Trap]] • [[Weightlifting]]
|}
{{br}}

====Tricksters====
{|border=1 cellspacing=0 cellpadding=3 align=left width=
|-
!bgcolor=#c40ad1 colspan=4|Tricksters
|-
|bgcolor=#e6c9ff align=center width=25%|[[Wario]]<br>[[File:M&SATLOG Wario Swimming artwork.png|150px]]
|bgcolor=#e6c9ff align=center width=25%|[[Dr. Eggman]]<br>[[File:M&SATLOG Dr Eggman Long Jump artwork.png|x150px]]
|bgcolor=#e6c9ff align=center width=25%|[[Waluigi]]<br>[[File:M&SATLOG Waluigi Shooting artwork.png|x150px]]
|bgcolor=#e6c9ff align=center width=25%|[[Metal Sonic]]<br>[[File:M&SATLOG Metal Sonic Hockey artwork.png|x150px]]
|-
|bgcolor=#e6c9ff|''The burly opposite of Mario, Wario is a Power-based athlete, able to hurl objects incredible distances, and his awesome stamina gives him a boost in any long-distance events. He is driven by greed and will undoubtedly love to get his hands on a Gold Medal!''
|bgcolor=#e6c9ff|''Although Dr. Eggman has great Skill-based abilities, he also is quite powerful. His huge, lumbering frame doesn't give the impression that he would be good at Gymnastics, but believe it or not, he can handle the Trampoline and Rings quite well.''
|bgcolor=#e6c9ff|''Waluigi,{{sic}} loves to compete against Luigi and is known to be a bit of a cheat and leads the rivals around the nose. His Skill-based abilities will translate well to events like Shooting.''
|bgcolor=#e6c9ff|''Modelled with extreme accuracy to Sonic by Dr. Eggman, Metal Sonic is one of our blue hero's earliest foes. He's out to get the better of Sonic and makes sure all of the Gold Medals are his.''
|-
|bgcolor=#c40ad1|Single character events
|bgcolor=#e6c9ff colspan=3|[[Long Jump (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Long Jump]] • [[100m Breaststroke]] • [[Handball]] • [[Badminton (Singles)]] • [[Taekwondo]] • [[1000m Kayak (Singles)]] • [[25m Rapid Fire Pistol]]
|-
|bgcolor=#c40ad1|Two character events
|bgcolor=#e6c9ff colspan=3|[[Platform Diving (Synchronised)]] • [[Hockey (event)|Hockey]]
|}
{{br}}

===Supporting characters===
{{image|more=yes|section=yes|Screenshots of all of the characters missing one, and perhaps some better ones of some of the existing ones too}}
As well as the athlete characters, the game also features a cast of supporting characters and species from the ''Super Mario'' and ''Sonic'' franchises that perform a variety of roles within the game, including forming parts of the crowd, competing as opponents in or refereeing events and serving as rivals or allies in the Story Mode. The game also introduces one entirely new species in the form of the [[imposter]]s that are created by Dr. Eggman in the game's Story Mode.
<gallery>
Nocoverart.png|[[Big (character)|Big]]<br>Appears in Story Mode and has a badge
M&S 2012 The Ghostly Tower.png|[[Boo]]<br>Appears as a rival in Story Mode and has a badge
Nocoverart.png|[[Bullet Bill]]<br>Appears in Story Mode and has a badge
M&S 2012 The Life of a Minion.png|[[Chain Chomp]]<br>Appears in Story Mode
M&S 2012 Junior Super Hero.png|[[Chao]]<br>Appears in Story Mode, as 2-character event rivals, as audience members and has a badge
M&S 2012 Waluigis Ambition.png|[[Charmy]]<br>Appears in Story Mode, as a referee and has a badge
M&S 2012 A Rainbow In Fog.png|[[Cheese (character)|Cheese]]<br>Appears in Story Mode
M&S 2012 A Rainbow In Fog.png|[[Cream (character)|Cream]]<br>Appears in Story Mode and has a badge
M&S 2012 Dr Eggmans Robots.png|[[Orbot & Cubot|Cubot]]<br>Appears in Story Mode, as a referee and has a badge
Nocoverart.png|[[SonicRetro:Cucky|Cucky]]<br>Appears as audience members and has a badge
M&S 2012 Foggy Foes.png|[[Dry Bones]]<br>Appears as a rival in Story Mode and has a badge
M&S 2012 Foggy Foes.png|[[Dry Bowser]]<br>Appears as a rival in Story Mode and has a badge
M&S 2012 Flapper and Egg Pawn.png|[[Egg Flapper]]<br>Appears in Story Mode and has a badge
M&S 2012 Flapper and Egg Pawn.png|[[Egg Pawn]]<br>Appears in Story Mode and has a badge
Nocoverart.png|[[Eggman Nega]]<br>Appears as a rival in Story Mode and has a badge
M&S 2012 The Banana Incident.png|[[Espio]]<br>Appears in Story Mode, as a referee and has a badge
Nocoverart.png|[[SonicRetro:Flicky|Flicky]]<br>Appears as audience members and has a badge
Nocoverart.png|[[Froggy (Sonic the Hedgehog series)|Froggy]]<br>Appears in Story Mode
M&S 2012 Junior Triumphant.png|[[Goomba]]<br>Appears in Story Mode, as audience members and has a badge
ModernPenthatlon.png[[Horse]]<br>Appears in events
M&S 2012 A Rainbow In Fog.png|[[Imposter]]<br>Appears in Story Mode
M&S 2012 The Wind Master.png|[[Jet (Sonic the Hedgehog)|Jet]]<br>Appers as a rival in Story Mode and has a badge
M&S 2012 The Ghostly Tower.png|[[King Boo]]<br>Appears as a rival in Story Mode and has a badge
SynchronizedSwimmingDuet 3DSLondon2012Games.png|[[Koopa Troopa]]<br>Appears as 2-character event rivals
M&S 2012 Bowsers Blues.png|[[Lakitu]]<br>Appears in events, Story Mode and has a badge
M&S 2012 Bowsers Blues.png|[[Kamek|Magikoopa]]<br>Appears in Story Mode and has a badge
M&S 2012 To the Ruins.png|[[Omega]]<br>Appears as a rival in Story Mode and has a badge
M&S 2012 Junior Super Hero.png|[[Omochao]]<br>Appears in Story Mode, as a referee, as audience members and has a badge
M&S 2012 Dr Eggmans Robots.png|[[Orbot & Cubot|Orbot]]<br>Appears in Story Mode, as a referee and has a badge
Nocoverart.png|[[SonicRetro:Pecky|Pecky]]<br>Appears as audience members and has a badge
Nocoverart.png|[[SonicRetro:Picky|Picky]]<br>Appears as audience members and has a badge
M&S 2012 The Life of a Minion.png|[[Piranha Plant]]<br>Appears in Story Mode
M&S 2012 The Mysterious Thief.jpg|[[Rouge]]<br>Appears as a rival in Story Mode and has a badge
M&S 2012 Junior Hits England.png|[[Shy Guy]]<br>Appears as a rival in Story Mode, as 4-character event rivals, as audience members and has a badge
Nocoverart.png|[[Thwomp]]<br>Appears in Story Mode
M&S 2012 Mario and Sonic.jpg|[[Toad]]<br>Appears in Story Mode, as a referee and has a badge
M&S 2012 An Innocent Request.png|[[Toad (species)|Toad]]<br>Appears in Story Mode, as a referee, as audience members and has a badge
</gallery>
{{br}}

==Events==
The Nintendo 3DS version of ''Mario & Sonic at the London 2012 Olympic Games'' features a total of 57 events, the most of any installment in the series. The events are split across 11 different classes, and make use of most of the features of the Nintendo 3DS as inputs for them. Each event has a specific character group that is used for it, and the player can only choose from characters in that group to play the event- for example, 100m is a Heroes event, and hence the player can only use Mario, Luigi, Sonic or Tails to play it. Each event has three difficulty settings which alter the performance of the COM characters in the events, as well as being given a game level rating which estimates the complexity of the event, going from one to three stars. Different events also require different numbers of characters, and as such may require the player to select multiple characters to compete in the event, or to pick one out to specifically control in the team. Some of the events also record records, which will have a starting record when the game is first played, but if the player manages to beat the record, their record will be stored as the top one for the event instead.
{|class="wikitable"
!Event
!Image
!Class
!Entry Characters
!Game Level
!Team Size
!Description
|-
|[[100m (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|100m]]
|[[File:Sprint2012.jpg|150px]]
|[[Athletics]]
|Heroes
|<font color="green">★</font>
|1
|A short event in which the player repeatedly presses the A Button to run 100m in the fastest time.
|-
|[[110m Hurdles (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|110m Hurdles]]
|[[File:110mHurdles3DS.jpg|150px]]
|Athletics
|Challengers
|<font color="blue">★★</font>
|1
|An event based around memorising a pattern made up of the A, B, Y, and X Buttons to complete the hurdles event in the fastest time.
|-
|[[1500m]]
|[[File:1500m.png|150px]]
|Athletics
|Challengers
|<font color="red">★★★</font>
|1
|An event which features frequently changing controls using the Control Pad and A, B, Y, and X Buttons to complete the last stretch of the 1500m in the fastest time.
|-
|[[3000m Steeplechase]]
|[[File:3000mSteeplechase.png|150px]]
|Athletics
|Challengers
|<font color="red">★★★</font>
|1
|An event where the player uses the A Button to jump over various obstacles and complete the course in the fastest time.
|-
|[[4x100m Relay (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|4x100m Relay]]
|[[File:4x100mRelay London2012Games.png|150px]]
|Athletics
|Heroes
|<font color="blue">★★</font>
|4
|An event in which the player uses the Touch Screen to accelerate and pass the baton with precise timing.
|-
|[[Marathon]]
|[[File:Marathon London2012Games.png|150px]]
|Athletics
|Heroes
|<font color="green">★</font>
|1
|A point-based event in which the player uses the A Button to collect water bottles.
|-
|[[20km Race Walk]]
|[[File:MarioRaceWalk.jpg|150px]]
|Athletics
|Heroes
|<font color="blue">★★</font>
|1
|An event in which the player uses the Touch Screen to walk in time with the beat of the music.
|-
|[[Long Jump (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Long Jump]]
|[[File:LongJump London2012Games.png|150px]]
|Athletics
|Tricksters
|<font color="blue">★★</font>
|1
|An event in which the player jumps by tilting their system towards them, with the length of the jump decided by the angle.
|-
|[[Triple Jump (Mario & Sonic at the London 2012 Olympic Games)|Triple Jump]]
|[[File:TripleJump London2012Games.png|150px]]
|Athletics
|Challengers
|<font color="blue">★★</font>
|1
|A timing-based event in which the player jumps by touching the Touch Screen.
|-
|[[Pole Vault (Mario & Sonic at the London 2012 Olympic Games)|Pole Vault]]
|[[File:PoleVault London2012Games.png|150px]]
|Athletics
|Heroes
|<font color="blue">★★</font>
|1
|An event in which the player charges up power by holding down the Circle Pad for different lengths of time to make higher jumps.
|-
|[[Hammer Throw (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Hammer Throw]]
|[[File:HammerThrow 3DSLondon2012Games.png|150px]]
|Athletics
|Wild Ones
|<font color="blue">★★</font>
|1
|An event in which the player grabs and throws the hammer using the L and R Buttons and builds power by tilting the console.
|-
|[[Javelin Throw (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Javelin Throw]]
|[[File:JavelinThrow 3DSLondon2012Games.png|150px]]
|Athletics
|Wild Ones
|<font color="blue">★★</font>
|1
|An event in which the javelin's thrown distance is determined by the angle of the line that the player draws on the Touch Screen.
|-
|[[Shot Put]]
|[[File:ShotPut 3DSLondon2012Games.png|150px]]
|Athletics
|Challengers
|<font color="blue">★★</font>
|1
|An event in which the shot put is thrown using the Circle Pad and the player can improve the distance by shouting into the microphone.
|-
|[[100m Freestyle (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|100m Freestyle]]
|[[File:100mFreestyle 3DSLondon2012Games.png|150px]]
|[[Aquatics]]
|Heroes
|<font color="green">★</font>
|1
|An event in which the player swims by alternately tapping the left and right sides of the Touch Screen.
|-
|[[100m Backstroke]]
|[[File:100mBackstroke London2012Games.png|150px]]
|Aquatics
|Girls
|<font color="blue">★★</font>
|1
|An event in which the player swims by drawing neat circles on the Touch Screen.
|-
|[[100m Breaststroke]]
|[[File:M&SATLOGSwimming2.jpg|150px]]
|Aquatics
|Tricksters
|<font color="blue">★★</font>
|1
|An event in which the player steadies the character's breathing by blowing into the microphone.
|-
|[[10km Marathon Swim]]
|[[File:10kmMarathonSwim.png|150px]]
|Aquatics
|Challengers
|<font color="red">★★★</font>
|1
|An event in which the player collects drinks to progress, using the Circle Pad to move and tilting the system to look around.
|-
|[[Platform Diving (Synchronised)]]
|[[File:PlatformDivingSynchronized 3DSLondon2012Games.png|150px]]
|Aquatics
|Tricksters
|<font color="green">★</font>
|2
|An event in which the player performs dives by pressing the A Button after waiting for the right timing.
|-
|[[Water Polo]]
|[[File:WaterPolo.png|150px]]
|Aquatics
|Challengers
|<font color="red">★★★</font>
|2
|An event in which the player swims to the ball by tapping left and right on the Touch Screen, and shoots for or defends the goal by sliding in different directions.
|-
|[[Synchronised Swimming (Duet)]]
|[[File:SynchronizedSwimmingDuet 3DSLondon2012Games.png|150px]]
|Aquatics
|Heroes
|<font color="blue">★★</font>
|2
|An event in which the player performs various moves by pressing the A Button and the Control Pad in time with the music.
|-
|[[Synchronised Swimming (Team)]]
|[[File:SynchronizedSwimmingTeam 3DSLondon2012Games.png|150px]]
|Aquatics
|Girls
|<font color="blue">★★</font>
|4
|An event where the player performs various moves by moving the system in time with the music.
|-
|[[Beach Volleyball (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Beach Volleyball]]
|[[File:BeachVolleyBall 3DSLondon2012Games.png|150px]]
|[[Court & Field Sports]]
|Girls
|<font color="blue">★★</font>
|2
|An event in which the player uses the A and B Buttons to perform various techniques and pass the ball.
|-
|[[Table Tennis (Doubles)]]
|[[File:TableTennisDoubles 3DSLondon2012Games.png|150px]]
|Court & Field Sports
|Heroes
|<font color="red">★★★</font>
|2
|An event in which the player hits the ball using the Button and swaps the characters' positions using the Control Pad.
|-
|[[Tennis (Singles)]]
|[[File:TableSingles 3DSLondon2012Games.png|150px]]
|Court & Field Sports
|Wild Ones
|<font color="blue">★★</font>
|1
|An event in which the player returns the ball by sliding in various directions on the Touch Screen.
|-
|[[Hockey (event)|Hockey]]
|[[File:Hockey 3DSLondon2012Games.png|150px]]
|Court & Field Sports
|Tricksters
|<font color="red">★★★</font>
|2
|An event in which the player moves the characters using the Circle Pad to pass the ball back and forth between each other to score goals.
|-
|[[Basketball (event)|Basketball]]
|[[File:BasketBall 3DSLondon2012Games.png|150px]]
|Court & Field Sports
|Challengers
|<font color="blue">★★</font>
|1
|An event in which the player makes consecutive throws to score points by moving the system.
|-
|[[Handball]]
|[[File:Handball 3DSLondon2012Games.png|150px]]
|Court & Field Sports
|Tricksters
|<font color="blue">★★</font>
|1
|An event in which the player defends the goal by moving the circle pad in the directions of the four corners.
|-
|[[Football (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Football]]
|[[File:Football 3DSLondon2012Games.png|150px]]
|Court & Field Sports
|Wild Ones
|<font color="blue">★★</font>
|1
|An event in which the player uses the Circle Pad to make different types of shot and score goals to earn points.
|-
|[[Badminton (Singles)]]
|[[File:MSATLOGSBadminton.jpg|150px]]
|Court & Field Sports
|Tricksters
|<font color="red">★★★</font>
|1
|An event in which the player decides whether to hit or dodge the shuttlecock using the A Button and Control Pad.
|-
|[[Badminton (Doubles)]]
|[[File:BadmintonDoubles 3DSLondon2012Games.png|150px]]
|Court & Field Sports
|Heroes
|<font color="blue">★★</font>
|2
|An event in which the player returns the shuttlecock by sliding upwards on the Touch Screen
|-
|[[Judo]]
|[[File:M&SATLOGJudo1.jpg|150px]]
|[[Contact Sports]]
|Heroes
|<font color="green">★</font>
|1
|An event in which the player quickly inputs button combinations to perform various moves and throws.
|-
|[[Boxing (Mario & Sonic at the London 2012 Olympic Games)|Boxing]]
|[[File:Boxing 3DSLondon2012Games.png|150px]]
|Contact Sports
|Wild Ones
|<font color="blue">★★</font>
|1
|An event in which the player uses the A Button to punch their opponent with the right timing.
|-
|[[Taekwondo]]
|[[File:Taekwondo 3DSLondon2012Games.png|150px]]
|Contact Sports
|Tricksters
|<font color="blue">★★</font>
|1
|An event in which the player charges up power by pressing and holding the A Button and moves using the Control Pad to score points by hitting the opponent.
|-
|[[Fencing - Epée (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Fencing - Epée]]
|[[File:FencingEpee 3DSLondon2012Games.png|150px]]
|Contact Sports
|Heroes
|<font color="blue">★★</font>
|1
|An event in which the player moves by tilting the system in various directions and thrusts using the A Button to touch the opponent and score points.
|-
|[[Wrestling - Freestyle]]
|[[File:WrestlingFreestyle 3DSLondon2012Games.png|150px]]
|Contact Sports
|Wild Ones
|<font color="blue">★★</font>
|1
|An event in which the player performs tackles and throws using the A and B Buttons to score points on the opponent, and moves using the Control Pad.
|-
|[[Horizontal Bar]]
|[[File:HorizontalBar 3DSLondon2012Games.png|150px]]
|[[Gymnastics]]
|Heroes
|<font color="blue">★★</font>
|1
|An event in which the player scores points by performing various moves on the horizontal bar by drawing circles on and touching the Touch Screen.
|-
|[[Balance Beam]]
|[[File:MSATLOGBalanceBeam.jpg|150px]]
|Gymnastics
|Girls
|<font color="blue">★★</font>
|1
|An event in which the player tilts the system in various ways to perform moves and score points.
|-
|[[Rings (event)|Rings]]
|[[File:Rings 3DSLondon2012Games.png|150px]]
|Gymnastics
|Wild Ones
|<font color="blue">★★</font>
|1
|An event in which the player scores points by performing moves using the Circle Pad and A, B, Y, and X Buttons.
|-
|[[Floor]]
|[[File:Floor 3DSLondon2012Games.png|150px]]
|Gymnastics
|Challengers
|<font color="green">★</font>
|1
|An event in which the player scores points by performing moves using various Touch Screen commands.
|-
|[[Trampoline (Mario & Sonic at the London 2012 Olympic Games for Nintendo 3DS)|Trampoline]]
|[[File:Trampoline 3DSLondon2012Games.png|150px]]
|Gymnastics
|Challengers
|<font color="blue">★★</font>
|1
|An event in which the player scores points by performing jumps using the A Button and keeps the character centred on the trampoline using the Circle Pad.
|-
|[[Rhythmic Ribbon (Team)]]
|[[File:RhythmicRibbonTeam.png|150px]]
|Gymnastics
|Girls
|<font color="blue">★★</font>
|4
|An event in which the player scores points by performing various moves using Touch Screen inputs.
|-
|[[Sprint]]
|[[File:Sprint 3DSLondon2012Games.png|150px]]
|[[Cycling]]
|Heroes
|<font color="red">★★★</font>
|1
|An event in which the player either blocks or overtakes their opponent to finsh the lap in the fastest time, using the Circle Pad to move and the A Button to accelerate.
|-
|[[Omnium]]
|[[File:Omnium 3DSLondon2012Games.png|150px]]
|Cycling
|Girls
|<font color="red">★★★</font>
|1
|An event in which the player strategically uses stamina hearts to get ahead using the Control Pad, and accelerates using the A Button.
|-
|[[Keirin]]
|[[File:Keirin 3DSLondon2012Games.png|150px]]
|Cycling
|Girls
|<font color="green">★</font>
|1
|An event in which the player uses the A Button to accelerate and finish the race in the fastest time.
|-
|[[BMX (Mario & Sonic at the London 2012 Olympic Games)|BMX]]
|[[File:BMX 3DSLondon2012Games.png|150px]]
|Cycling
|Heroes
|<font color="blue">★★</font>
|1
|An event in which the player competes to finish the course in the fastest time, steering using the Circle Pad, jumping using the A Button and landing by tilting the system.
|-
|[[Show Jumping (Team)]]
|[[File:ShowJumpingTeam.png|150px]]
|[[Equestrian (class)|Equestrian]]
|Girls
|<font color="blue">★★</font>
|4
|An event in which the player aims to complete the course in the fastest time by steering with the Circle Pad and jumping with the A Button.
|-
|[[Rowing - Quadruple Sculls]]
|[[File:Rowing - Quadruple Sculls.png|150px]]
|[[Boat Games]]
|Heroes
|<font color="blue">★★</font>
|4
|An event in which the player rows by moving the system in time to complete the distance in the fastest time.
|-
|[[1000m Kayak (Singles)]]
|[[File:M&SATLOGKayak1.jpg|150px]]
|Boat Games
|Tricksters
|<font color="green">★</font>
|1
|An event in which the player accelerates by rapidly spinning the Circle Pad to complete the race fastest.
|-
|[[Canoe Slalom (Pair)]]
|[[File:CanoeSlalom.png|150px]]
|Boat Games
|Girls
|<font color="red">★★★</font>
|2
|An event in which the player accelerates using the A Button and balances using the Circle Pad to complete the course fastest.
|-
|[[Sailing - 470 (Pair)]]
|[[File:Sailing470Pair.png|150px]]
|Boat Games
|Heroes
|<font color="blue">★★</font>
|2
|An event in which the player angles their sail using the circle pad and stokes the wind by blowing into the microphone to complete the course fastest.
|-
|[[Double Trap]]
|[[File:DoubleTrap London2012OlympicGames.png|150px]]
|[[Shooting (class)|Shooting]]
|Wild Ones
|<font color="red">★★★</font>
|1
|An event in which the player aims by moving around the system and fires using the R Button to hit the most targets.
|-
|[[25m Rapid Fire Pistol]]
|[[File:25mRapidFirePistol.png|150px]]
|Shooting
|Tricksters
|<font color="green">★</font>
|1
|An event in which the player makes five quick shots using the R Button to score as many points as possible.
|-
|[[Archery (Individual)]]
|[[File:ArcheryIndividual.png|150px]]
|Shooting
|Girls
|<font color="blue">★★</font>
|1
|An event in which the player aims and makes shots using Touch Screen inputs to score the most points using five arrows.
|-
|[[Archery (Team)]]
|[[File:ArcheryTeam.png|150px]]
|Shooting
|Heroes
|<font color="blue">★★</font>
|4
|An event in which the player aims by moving the system and shoots using the R Button to score the most points with four arrows.
|-
|[[Weightlifting]]
|[[File:Weightlifting London2012OlympicGames.png|150px]]
|[[Weightlifting (class)|Weightlifting]]
|Wild Ones
|<font color="green">★</font>
|1
|An event in which the player sets the weight of their dumbbell using the Control Pad and lifts it by shouting into the microphone.
|-
|[[Triathlon]]
|[[File:Triathlon.png|150px]]
|[[Multi-Discipline]]
|Heroes
|<font color="blue">★★</font>
|1
|An event in which the player uses the A and B Buttons to perform a variety of actions to complete all three stages of the course in the fastest time.
|-
|[[Modern Pentathlon]]
|[[File:ModernPentathlon.png|150px]]
|Multi-Discipline
|Heroes
|<font color="blue">★★</font>
|1
|An event in which the player use various Touch Screen inputs and blows in the microphone to complete actions and score the highest number of points.
|}
{{br}}

==Demo==
On March 1, 2012, a demo of the 3DS version of the game was released on the [[Nintendo 3DS#Nintendo eShop|Nintendo eShop]]. Five events are playable in the demo: 25m Rapid Fire Pistol, Football, Trampoline, 100m Backstroke, and BMX. The player cannot choose their character or name, as it is always set to "M&S". The demo can be launched a maximum of 30 (20 in Europe) times once downloaded.

==Reception==
''Mario & Sonic at the London 2012 Olympic Games'' received mainly mixed reviews from critics with some positive ones, scoring an average of 66 on Metacritic based on 28 reviews and 67.30% on GameRankings. Critics praised the gameplay of many of the game's events and the large amount of content, though criticized the limited multiplayer modes, control schemes for certain events and the similarity to previous installments in the series.

Richard George of IGN gave the game a 6.5 out of 10, praising the majority of the events, as well as the collectibles and use of medals and records, but criticized some of the simpler events and the restriction of certain characters to specific events. George also criticized the game's Story Mode and lack of Dream Events, frequently comparing the title to earlier ones in the series. Mark Reece of Nintendo Life gave the game a 6/10, similarly criticizing some of the control schemes, the Story Mode and overall weaker quality in comparison to earlier instalments, but praised the game's graphics and variety of collectibles and events. Shane Jury of Cubed3 gave the game an overall more positive review with a score of 8 out of 10, also praising on the game's graphics and event gameplay, as well as the advantages of simplified nature of the game, use of all of the input types of the [[Nintendo 3DS]] and the Story Mode, unlike the other reviewers. Jury also praised the game's soundtrack, but also criticized the game's poorly implemented multiplayer modes and unrealised potential.
{| class="wikitable reviews"
!colspan="4"style="font-size:120%; text-align: center; background-color:silver"|Reviews
|-style="background-color:#E6E6E6"
|Release
|Reviewer, Publication
|Score
|Comment
|-
|Nintendo 3DS
|Richard George, [https://www.ign.com/articles/2012/02/14/mario-sonic-at-the-london-2012-olympic-games-review-2 IGN]
|6.5/10
|align="left"|"''Perhaps that's what makes Mario & Sonic at the London 2012 Olympic Games on the 3DS so frustrating. While it has some great mini-games, it forcefully limits itself and discards many of the ideas that made its predecessors so good. There are some good elements here though. Acquiring medals, ranking your best scores globally and earning medals can be very addicting. But only half of these games are worth playing. Most are simply shallow attempts at their counterparts, which is more or less what this version of the London Olympic Games ends up being.''"
|-
|Nintendo 3DS
|Shane Jury, [http://www.cubed3.com/review/1087/1/mario-and-sonic-at-the-london-2012-olympic-games-nintendo-3ds.html Cubed3]
|8/10
|align="left"|"''Mario and Sonic's sporting antics make for an enjoyable 3DS debut that radiates character and graphical prowess, together with a wide array of varying competitive events and versatile methods of play, though a weaker multiplayer offering ensures a Silver Medal for Mario & Sonic at the London 2012 Olympic Games' long-range appeal.''"
|-
|Nintendo 3DS
|Mark Reece, [https://www.nintendolife.com/reviews/3ds/mario_and_sonic_at_the_london_2012_olympic_games Nintendo Life]
|6/10
|align="left"|"''The Mario & Sonic games were once a shining example of how minigame collections should be developed. However, while Mario & Sonic at the London 2012 Olympic Games is technically no worse than its forebears, its events are too much of a mixture when it comes to quality and after four years the blemishes and inconsistencies are beginning to wear thin. It's by no means a train wreck and a valiant first effort for the series in its jump to 3DS, but with the next inevitable release due in two years it's imperative that Nintendo and SEGA use that time to iron out the wrinkles and make this the all-star collaboration it truly deserves to be.''"
|-
!colspan="4"style="background-color:silver; font-size:120%; text-align: center;"|Aggregators
|-style="background-color:#E6E6E6"
|colspan=2|Compiler
|colspan=2|Platform / Score
|-
|colspan=2|Metacritic
|colspan=2 style="background-color:Gold"|[https://www.metacritic.com/game/3ds/mario-sonic-at-the-london-2012-olympic-games 66]
|-
|colspan=2|GameRankings
|colspan=2|[https://www.gamerankings.com/3ds/627575-mario-and-sonic-at-the-london-2012-olympic-games/index.html 67.30%]
|}
{{br}}

==Staff==
{{main|List of Mario & Sonic at the London 2012 Olympic Games (Nintendo 3DS) staff}}
Similarly to many of the other games in the series, ''Mario & Sonic at the London 2012 Olympic Games'' was developed by [[Sega]] and Group 4 of [[Nintendo Software Planning & Development]], with Sega also handling the publishing in most regions, and [[Nintendo]] publishing the game in Japan and South Korea. The game shares many of the key staff with the Wii version of the game, with both featuring Nobuya Ohasis as producer and Okitane Usui as executive producer. Osamu Ohashi as chief producer from Sega, and Tomoyoshi Hamane, Emi Watanabe, Toyokazu Nonaka, [[Hiroshi Sato]], [[Shigeru Miyamoto]] and [[Satoru Iwata]] in various production roles for Nintendo.  The Nintendo 3DS version does have some specific staff, with Koji Shindo as director and Shinya Takahashi as a general producer for Nintendo. Many of the staff for this game have returned from working on earlier instalments in the series.

==Gallery==
{{main-gallery|Mario & Sonic at the London 2012 Olympic Games}}
<gallery>
MASATLOG Logo.png|The game's logo
M&SATLOG Dr Eggman Hockey artwork.png|Dr. Eggman with a hockey stick
PeachBalanceBeam.jpg|Peach competing in Balance Beam
M&S 2012 Fog Machine.png|Bowser and Dr. Eggman in The Night Before
M&SLondon3DSLuigiModel.png|Luigi's model
MSL12 UK3DS.jpg|United Kingdom box art
</gallery>

==Pre-release and unused content==
All the playable characters were originally going to have swimwear for the aquatic events rather than just the female characters. However, the idea was rejected by Sega because Sonic cannot have his shoes removed. Eventually, some of the male characters were given swimwear in ''[[Mario & Sonic at the Olympic Games Tokyo 2020]]''.<ref>{{cite|author=Watts, Steve|url=www.shacknews.com/article/71640/how-mario-and-sonic-get-outfitted-for-the-olympics|title=How Mario and Sonic get outfitted for the Olympics|publisher=Shack News|December 19, 2011|accessdate=May 21, 2024}}</ref>

==References to other games==
*''[[Mario & Sonic at the Olympic Winter Games]]'' - In Story Mode, Toad, Magikoopa, and Silver reference competing in this game.
*''[[Mario & Sonic at the London 2012 Olympic Games (Wii)|Mario & Sonic at the London 2012 Olympic Games]]'' - This game is the Wii counterpart and shares many elements with the Nintendo 3DS version, including characters, general aesthetic and music. Interestingly, the music used for placing outside of the top three in the Wii version is used for placing third in this game, with a different track being used for fourth place.

==Quotes==
{{Main|List of Mario & Sonic at the London 2012 Olympic Games quotes}}
===Mario===
*"''It's-a Mario Time!''"
*"''Oh, no! I lost!''"
*"''Oh, Mario get you next time!''"
*"''Wahoo, I'm the winner!''"

===Luigi===
*"''Oh, yeah!''"
*"''Oh well...''"
*"''Oh yeah, I'm a winner!''"
*"''Aw, it's not that bad.''"

===Sonic===
*"''Whew, just made it.''"
*"''Sonic speed!''"
*"''It's all about speed.''"
*"''Aw, messed up.''"

==Names in other languages==
{{foreign names
|Ger=Mario & Sonic bei den Olympischen Spielen: London 2012
|GerM=Mario & Sonic at the Olympic Games: London 2012
|Spa=Mario & Sonic en los Juegos Olímpicos - London 2012
|SpaM=Mario & Sonic at the Olympic Games - London 2012
|Dut=Mario & Sonic op de Olympische Spelen - Londen 2012
|DutM=Mario & Sonic at the Olympic Games - London 2012
|Por=Mario & Sonic nos Jogos Olímpicos de Londres 2012
|PorM=Mario & Sonic at the London 2012 Olympic Games
|Fre=Mario & Sonic aux Jeux Olympiques de Londres 2012
|FreM=Mario & Sonic at the London 2012 Olympic Games
|Ita=Mario & Sonic ai Giochi Olimpici di Londra 2012
|ItaM=Mario & Sonic at the London 2012 Olympic Games
|Jap=マリオ&ソニック AT ロンドンオリンピック
|JapR=Mario ando Sonikku atto Rondon Orinpikku
|JapM=Mario & Sonic at the London Olympics
|Kor=마리오와 소닉 런던 올림픽
|KorR=Mario-wa Sonik Leondeon Olimpik
|KorM=Mario & Sonic at the London Olympics
}}

==Media==
{{media table
|file1=MASATLOG Trailer.ogv
|title1=Mario & Sonic at the London 2012 Olympic Games
|description1=The game's trailer.
|length1=1:28
|file2=MASATLOG Trailer2.ogv
|title2=Mario & Sonic at the London 2012 Olympic Games
|description2=The game's alternative trailer.
|length2=2:37
|file3=MASATLOG Trailer3.ogv
|title3=Mario & Sonic at the London 2012 Olympic Games
|description3=The game's second trailer as seen on Nintendo 3DS Conference 2011.
|length3=1:01
|file4=MASATLOG Theme.oga
|title4=Mario & Sonic at the London 2012 Olympic Games
|description4=The game's theme, as heard in the E3 2011 trailer.
|length4=0:30
|file5=MASATLOG Theme2.oga
|title5=Mario & Sonic at the London 2012 Olympic Games
|description5=The game's theme, as heard in the intro.
|length5=0:30
}}

==References==
<references/>

==External links==
*[[Sonicretro:Mario & Sonic at the London 2012 Olympic Games|''Mario & Sonic at the London 2012 Olympic Games'' on Sonic Retro]]
*{{fandom|sonic|Mario & Sonic at the London 2012 Olympic Games|''Mario & Sonic at the London 2012 Olympic Games'' on Sonic News Network}}
*[https://www.nintendo.co.jp/wii/siij/index.html Official Japanese Website]
{{M&SATLOG}}
{{Super Mario games}}
{{3DS}}
[[Category:Mario & Sonic at the London 2012 Olympic Games|*]]
[[Category:Games]]
[[Category:Crossover games]]
[[Category:2012 games]]
[[Category:Sports games]]
[[Category:Nintendo 3DS games]] 
[[Category:Games with demos]]
[[Category:Games with Nintendo Network]]
[[de:Mario & Sonic bei den Olympischen Spielen London 2012]]
[[it:Mario & Sonic ai Giochi Olimpici di Londra 2012 (Nintendo 3DS)]]