Keeping in line with the Crazy Castle series' overseas licensing issues, the second game in the series, released on the Game Boy, would receive no less than five distinct versions overhauled with different licensed properties. It was first released as Mickey Mouse II in Japan, then released as The Bugs Bunny Crazy Castle 2 in North America, and was then brought over to Europe with the Mickey Mouse license again, but only had the number in the title truncated. It was later re-released in Europe as an updated version themed around the Danish media franchise Hugo, adding Super Game Boy support and a slightly remixed soundtrack. The game's final release in Japan as part of the Bugs Bunny Collection would revert to The Bugs Bunny Crazy Castle 2 version while including the Super Game Boy support, borders and palettes from the Hugo release.