Knuckles the Echidna in Sonic the Hedgehog - Mega Drive/Genesis Game
Region-free. Will work on UK/EUR/US consoles.
Knuckles has all the moves he has in Sonic and Knuckles, including gliding, wall climbing, and the spin dash. Not only that, Knuckles can transform into his Super form once he obtains all the emeralds (a cheat must first be enabled).