Light a flare
Take 1 step forward
Take one step back
Turn around 3 times
By doing this you will blown yourself up and die.
Only use this cheat for fun. Do not use this cheat when near the end and almost complete!!!
To skip the level, do these actions in this order: Sidestep left, sidestep right, sidestep left, step backward, step forward, spin two times, forwards jump turn.
Note: For these cheats, flipping in the air is required. In order to do so, simply press Up+Square+Circle (Up+Jump+Roll) while jumping forward or backward. If you can't get it on the first try, just keep at it, you'll get it.
From the ground, Hold L2(sidestep)And step LEFT, then RIGHT, then LEFT again, then BACKWARDS, then FORWARDS, spin in place 3 times, then JUMP FORWARD and ROLL IN THE AIR. The game should stop and you'll see the level end screen.
From the ground, Hold L2(sidestep)And step LEFT, then RIGHT, then LEFT again, then BACKWARDS, then FORWARDS, spin in place 3 times, then JUMP BACKWARDS and ROLL IN THE AIR. You should hear a clicky sound, and when you open your inventory, you will have all weapons with alot of ammo, increased amounts of health packs and flares. Some weapons have a set amount of ammo for this cheat, but if you want to up your health packs or flares, repeat the trick.