Due to it's insane difficulty, Ninja Gaiden Black, a bonus-packed re-release, came with an unlockable "ninja dog mode" that made the game easier, at the expense of your manliness.
While some people may not consider it as part of a list of Nintendo Wii game cheats, the unlockable characters are nonetheless a very important part of SSBB.
Perhaps the most interesting unlockable characters are the Mii avatars.
However to reconcile this, Sega has more recently re-released this game in a compilation, as well as including it as an unlockable extra in Adventure DX and Gems Collection.
Canvas Curse is a long game with lots of varied stages and tons of unlockable extras.
