Sonic X is an educational game released in 2005 or 2007 for the Leapster handheld learning game system. It is based on the Sonic X anime. It is aimed towards children between the ages of five and seven and progress is made primarily through solving mathematical problems such as numerical ordering, addition and subtraction.
The game involves Sonic the Hedgehog and Christopher Thorndyke attempting to rescue their friends (Tails, Amy and Knuckles) from Doctor Eggman. The game has three levels (Station Square, Angel Island and Eggman's base), as well as three minigames.
The game plays like a traditional Sonic game and allows players to run around levels and leap platforms. Rings are scattered around the levels which can be collected. Problem solving is also incorporated as there are question marks throughout the level that can only be passed after solving a mathematical equations such as counting, matching numbers, addition and subtraction. There are also occasions where Eggman's Badniks will pick Sonic up and ask questions about rings, and the pen must be used to answer the questions.
- This is the only Sonic game to feature Christopher Thorndyke (apart from a cameo appearance in Sonic Adventure DX. He appears in the game's animated cutscenes and cheers Sonic on when clearing a math problem.
- Character sprites are ripped directly out of Sonic 3.
- This is the only Sonic game until Sonic Boom to be fully based in a canon that isn't the game canon that wasn't a modfied version of another game.
- This is the only form of Sonic X media not to have Cosmo the Seedrian in even a cameo role.