The Ultimate Bugs Bunny Crazy Castle
Original title: The Bugs Bunny Crazy Castle
Platform: Nintendo Entertainment System
Region: USA (Update Hacks)
Media: Cartridge
Controller: NES Gamepad
Genre: Platformer 
Gametype: Hack
Release Year: 2003
Hacked by: Frank
Version: 1.1
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This is the first hack ever to change the levels of The Bugs Bunny Crazy Castle, for the NES. The first, and the best! All 60 stages are changed, including the 4 special stages. The game starts pretty easy, but gets quite difficult by the end!

http://www.romhacking.net/hacks/200/