Castle of Illusion Starring Mickey Mouse[a][b] is a 1990 platform game developed and published by Sega and released for the Mega Drive/Genesis.

A remake of the game by Sega Studios Australia was released for PlayStation Network, Windows and Xbox Live Arcade in September 2013.

Upon meeting and conversing with the castle's true owner and king, Mickey is told that in order to defeat Mizrabel he must find the Seven Gems of the Rainbow.

The army consists of bizarre creatures, such as enchanted mushrooms, toy soldiers, ball-juggling, unicycle-riding clowns, spiders and armored knights.

A superbly animated Mickey bops through three different worlds—the Enchanted Forest, Toyland, and the Dessert Factory—in a quest to save Minnie from the evil witch Mizrabel".

[21] ACE called the Game Gear version "basically an unadulterated Mario clone—and not a bad one at that", giving it a score of eight out of ten.

[28] Console XS called the Castle of Illusion one of best games on the Master System writing: "Brilliant animation and sprite definition make this a joy to watch".

[30] A sequel, Land of Illusion Starring Mickey Mouse, was released for the Master System in 1992 and for the Game Gear in 1993.

In 1995, Legend of Illusion Starring Mickey Mouse was released for the Game Gear, with a Master System port following in 1998 in Brazil.

A remake of the game, developed by Sega Studios Australia, was released for the PlayStation Network, Xbox Live Arcade and PC in September 2013.