Unlock Sudden Death Mode
To unlock Sudden Death Mode, beat the game on the Hard difficulty while getting the best ending. In this mode, one hit kills just about anything, including bosses and even you, so be careful!

Unlock All Versus Mode Characters
To unlock all Versus Mode players, you can punch in the following button combo, or you can just finish Story Mode if you want to really earn them. Enter this code at the Start Game screen BEFORE the game demo starts. Just press Up, Down, Down, Right, Right, Right, Left, Left, Left, Left (All on D-Pad), C-Up, and Start.

Open Up Trial Mode
Once again, this mode will be unlocked when Story Mode is completed, or you can punch in this sequence to unlock it immediately. Press Up, Down, Down, Right, Right, Right, Left, Left, Left, Left (All on D-Pad), C-Down, and Start.

Unlock Max Power Cheat
To get the Max Power cheat, you must beat the game on Normal difficulty. The cheat will be unlocked and you can have infinite ammo for all weapons.