PO’ed PS Cheats

All Weapons:


  Enter the map mode by pressing Square+Select. Now press Left on the D-pad until 
  the arrow is pointing at you. Press Start to return to standard view and, while 
  the camera is rotating, press L1+Square+X+O simultaneously. Then, 
  press Select to get out of Map mode. When you press Triangle you will have all 
  of the weapons. 
Invulnerability:


  First, you need to have the drill. Next, press Triangle to bring up the weapons 
  menu. Use L1 or R1 to scroll to and select the Frying Pan by pressing Triangle. 
  Now, press Triangle again to bring up the weapons menu again. Press O+R1 
  until you get a flashing '999' in your health counter. Press O+R1 again 
  to cancel invulnerability.
Full ammo:


  Do a backflip by pressing Square + L2. While flipping, press Right + X + O. 

 No Collision Detection:


  First, make sure you have your jetpack on. Next, find a dead body and stand 
  on it. Press Triangle to bring up the weapons select screen and press L1+Right/Down. 
  If the code works, you will immediately fall through the floor. To turn collision 
  detection back on, press Triangle and press L1+Right/Down while in the weapons 
  select screen again.
 Level Select:


  Go to the Main Menu screen and press L1+L2+R1+R2+Up simultaneously, 
  then let go. Next, select a new game. Press L1+L2+R1+R2+Down at the same 
  time, then let go. Select the difficulty level. A level select menu will 
  pop up with all the levels available. 
View ending: 


  Load a saved game. Hold Right, then press Circle. Release Right and press Triangle 
  to cancel. Next, press Left + Square, then press Triangle to cancel again. You'll 
  now see the ending sequence...
 
 
 
Thanks to Revolution readers Ray LaChance, Jeff Williams, Chris Marks, and 
  Breana Mahaffey!