Sonic X Leapster

Sonic X is based on the anime series of the same name and was released by LeapFrog Enterprises for the Leapster handheld game console. It stars Sonic and Chris Thorndyke, a character created for the anime series, who must save Tails, Amy, and Knuckles from Doctor Eggman. The player must guide Sonic through three levels, periodically stopping to answer math questions. The three levels, Station Square, Angel Island, and Eggman's base feature sequencing, addition, and subtraction respectively.