Castle of Illusion Starring Mickey Mouse (8-bit)

Castle of Illusion Starring Mickey Mouse, Game Gear version is known in Japan as Mickey Mouse no Castle Illusion (ミッキーマウスのキャッスル・イリュージョン) is a platform game released in 1990 featuring the mascot of Disney, Mickey Mouse. This is an 8-bit counterpart to the Sega Mega Drive game of the same name, which although shares the same story and basic design concepts, has differing levels and gameplay mechanics.

Story
Castle of Illusion follows Mickey Mouse as he attempts to defeat the witch Mizrabel who has kidnapped Minnie. As he approaches the entrance of Mizrabel's castle, a mysterious old man appears and offers him assistance. Mickey must defeat Mizrabel's henchmen in each level and obtain a crystal which, if all of them obtained, will open up the route to witch's throne room.