"Castle of Illusion Starring Mickey Mouse" is a platform video game developed by Sega and released in 1990 for the Sega Genesis. Players control Mickey Mouse as he embarks on a quest to rescue Minnie Mouse from the evil witch Mizrabel. The game features colorful graphics and imaginative levels, each with unique challenges and enemies. The gameplay involves jumping, running, and using various items to defeat foes and solve puzzles. Players navigate through different themed worlds, such as forests and castles, while collecting gems and power-ups. The game is well-regarded for its charming art style and engaging gameplay, making it a classic in the Mickey Mouse franchise.