Invincibility
At the code entry screen, press X, X, X, R, A, L, L, Y.
God Mode
At the code entry screen, press Y, A, B, X, B, A, A, L.
All Levels
At the code entry screen, press Y, White, Black, L, A, R, R, Y.
Full Health Bar
At the code entry screen, press X, R, A, Y, Black, B, A, R.
Infinite Ammo
At the code entry screen, press A, L, L, Black, B, White, L, L.
Full Ammo
At the code entry screen, press Black, B, A, R, R, A, L, Black.
Big Head Mode
At the code entry screen, press L, Black, B, White, White, B, Black, L.
Big Hand Mode
At the code entry screen, press R, White, X, L, White, R, R, Y.
Big Boots Mode
At the code entry screen, press R, White, Y, A, L, B, White, X.