They say this code Unlocks All Cards, which simply means it unlocks all character cards on the Mode Selection Screen, but it also unlocks 5 other challenges in Party Mode, including of all things Tag
While in the Mode screen you input the following code
Square, Triangle, Circle, Square, Triangle, Circle, Square, Triangle, Circle, Square, Triangle, Circle
Well worth it.
Lastly Option 3 Challenge Mode standard Super Monkey Ball Levels, hard but fun.
Overall I say this game is a real challenge, some will struggle as this game is tough. While others I really don't know as this game is so fuckin' unique.
Otherwise Good Game overall