"Bunnie Rabbot in Sonic the Hedgehog (aka Bunnie Rabbot in Sonic 1) is a character swap hack of the game Sonic the Hedgehog for the Sega Mega Drive, with character Bunnie Rabbot as the playable character in place of Sonic the Hedgehog."
http://info.sonicretro.org/Bunnie_Rabbot_in_Sonic_the_Hedgehog
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