Castle of Illusion Starring Mickey Mouse for the Game Gear is virtually identical to its Master System counterpart. The characters are a little too small relative to the screen in this version of the game, and there's a missing area or two within a couple of the levels, but gameplay and graphics remain essentially the same. One interesting note: The knights in the Haunted Castle portion of the Master System game are simple ghosts in this version. ~ Brett Alan Weiss, All Game Guide