Spark

Spark's are flashing balls of energy that only move along the edges of objects in Super Mario Bros. 2. They're most common in world 7, and are defeated by being hit with Mushroom Blocks. Study their pattern and speed so you can move without getting hurt. They move either slowly, or fast, and can overlap each other instead of turning around like Shy Guys. Possible realatives are Watt, Hotheads, and Li'l Sparks.