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Are you a bad enough dude to
The first of two licensed Sonic titles for LeapFrog systems (The second being Sonic for the Didj), Sonic X is pretty much a reskin of fellow Leapster game Numbers on the Run: Counting on Zero. This game itself would later get reskinned as Go Diego Go!: Animal Rescuer.
You’re too good, Sonic.
Unused Placeholder Credits
The file 23.swf is a version of the credits sequence that uses placeholder text rather than actual credits.
Counting on Zero Leftovers
There are a lot of leftover sprites from Counting on Zero in the game's files. We mean it. But hey, this was bound to happen considering that this game is a reskin of it.