The Bugs Bunny Crazy Castle 2, known in Japan as Mickey Mouse II (ミッキーマウスII) and known in Europe either as Hugo or simply Mickey Mouse, is a video game developed by Kemco for the Game Boy. It is the sequel to the 1989 Nintendo Entertainment System and Game Boy game The Bugs Bunny Crazy Castle.
Bugs Bunny must save his girlfriend Honey Bunny from Witch Hazel's enemy-filled castle. There are 28 levels with keys to collect. In each level is a locked door leading to the next level; to open it, the player must collect eight keys placed throughout the level. Various Looney Tunes characters are encountered, including Yosemite Sam, Daffy Duck, Wile E. Coyote, Sylvester, Foghorn Leghorn, Tasmanian Devil, Beaky Buzzard, Spike, Merlin the Magic Mouse, and Tweety.