Enter while playing
up, down, left, right, A, B --> All Weapons
up, down, left, right, up, down, left, right --> God Mode
right, down, left, A --> Kungfu Fists
up, up, down, down, A, B, A, B --> Minigun
up, A, up, B, Y, up, X --> Nofall (prevents player from being knocked down)
A, B, Y, X, A, B, Y, X --> Nuke (kills all spawned enemies)
X, up, right, up, right --> Unlock All Levels