Infinite Health and Ammo:
Put a gun and a health kit in your inventory to start. Then pause game and press Y, X, L, R, L, R, X, Y, L, Y, Y, R
Level Select and Great Escape Mode:
At the main menu press Y, R, Y, X, Y, R, X, L, X, X, X, Y
Infinite Health and Ammo:
Put a gun and a health kit in your inventory to start. Then pause game and press Y, X, L, R, L, R, X, Y, L, Y, Y, R
Level Select and Great Escape Mode:
At the main menu press Y, R, Y, X, Y, R, X, L, X, X, X, Y