Region-free. Will work on UK/EUR/US consoles.
Shadow the Hedgehog in Sonic the Hedgehog (aka Shadow in Sonic 1) is an updated version of the game Sonic the Hedgehog for the Sega Mega Drive/Genesis, with Shadow the Hedgehog as a playable character in place of Sonic the Hedgehog.
The game was created by Sonic Retro member FeliciaVal, with additional programming and coding by other members including Jimmy Hedgehog, Selbi, MarkeyJester and E-122-Psi.
Mostly due to Shadows palette being shared with other sprites, several colors are changed. This means grey springs, grey Crabmeats, and many other changes.