Press X, L1, R1, L2, R2, X, Up, Down, Right, Left, Down,Up during normal game play.
Dead Island: Chrome 2 Poster
Inside of the hotel, on the quest "BORN TO BE WILD," talk to Mike Davies. After that, move to the next room where a workbench is present. Enter the next room where you will find one of the computers to reboot. If you look at the wall to the side of the desk with the fan on it, you will see a poster displaying "Chrome 2," one of Techland's next upcoming games. Techland is also the producer of Dead Island.
Dead Island: Unlimited Weapons (Pre-Patch)
While holding any melee weapon, hold L1 to get ready to throw your weapon. Then, hold triangle, and press R1 to throw the weapon. If done correctly, you should throw an exact replica down on the ground in front of you.
Infinite Ammunition
Press L1, R1, L2, R2, X, Up, Down, Left, Down, Right, Down, Up during normal game play.
All Guns...