X2: Wolverine's Revenge

Level Select:
Press B, X, B, Y, B, X, L, R and Z at the main menu to unlock level select.

Unlock Cheats:
Press B, B, X, X, Y, Y, X, X, L, L, R, R and Z at the main menu to unlock all of the cheats. These cheats can be accessed on the pause menu.

All Costumes:
Press B, X, B, Y, Y, Y, L, L and Z at the main menu to unlock all costumes.

All Cerebro Files:
Press B, X, B, Y, Y, Y, R, R and Z at the main menu to unlock all Cerebro files.