Level select
 
 At the main menu, press and release L1 + L2 + R1 + R2 + Up. Press
 Circle to start a new game. From the difficulty menu, press L1 + L2 +
 R1 + R2 + Down. Choose a difficulty and the level select menu will
 appear. 
 
 Fart sounds
 
 Highlight a game from the load game menu. Then, press L1 + L2 + R1 +
 R2. Exit the load game menu. Now levels with the Butthead monster
 will be modified by the code.
 
 Full inventory
 
 While playing a game, press Square + Select to enter 3D map mode.
 Press Left until the map arrow points toward you, then press Start to
 return to standard map view. Press L1 + Square + X + Circle while the
 camera is rotating. Press Select to exit Map mode. Press Triangle and
 for all the weapons and the jetpack. 
 
 Full ammunition
 
 While playing a game, do a back flip by pressing Square + L2. Then
 while in the air, press Right + X + Circle. Now the ammunition for
 all weapons will be returned to full.
 
 Full health
 
 While playing a game, do a back flip by pressing Square + L2. Then
 while in the air, press Down + X + R2. Now Ox's health will be
 returned to full. 
 
 Invincibility
 
 Use the full inventory code or find the drill to place it in
 inventory. Use the frying pan as the current weapon. Enter the weapon
 selection screen and highlight the drill, then press Circle + R1. If
 you entered the code correctly, the number "999" will be flashing
 next to the health meter. 
 
 Disable invulnerability
 
 Enter the weapon selection screen and press Circle + R1.
 
 View ending sequence
 
 Save at least one game. Then, go to the main menu and highlight "Load
 Game". Hold Right, then press Circle. Release Right and press
 Triangle to cancel. Next, press Left + Square, then press Triangle to
 cancel again. Now the ending sequence will be displayed.
 
 No collisions
 
 Switch to jetpack mode and kill an alien. Stand on the alien and
 press Triangle to display the weapon select screen. Then, press L1 +
 Right + Down. Now Ox will be able to fly through the walls and move
 anywhere in the level. 
 
 Disable no collisions
 
 Switch to jetpack mode and press Triangle to display the weapon
 select screen. Then, press L1 + Right + Down.
 
  Game Shark Code
 
                 
  Infinite Energy               
  8009ABA0 0066
                 
  Invincible                    
  8009ABA0 0064
                 
  Infinite Flamer Ammo          
  8009ABA8 03E7
                 
  Infinite BFD90 Ammo           
  8009ABA4 001E
                 
  Infinite Ammo for BFD90/Pulse 
  8009ABA4 03E7
                 
  Infinite Rockets              
  8009ABB4 03E7
                 
  Infinite Wailer Ammo          
  8009ABAC 03E7
                 
  Infinite Meatseeker Ammo      
  8009ABB0 03E7
                 
  Infinite Jetpack Fuel         
  8009ABA8 0032
                 
  Have Jetpack                  
  8009AC70 0100
                 
  Have Knife                    
  8009ABB8 0101
                 
  Have Drill                    
  8009ABBA 0101
                 
  Have Missile Cam              
  8009ABC2 0001
                 
  Have BFD90 & Flame Thrower    
  8009ABBC 0101
                 
  Have Wailer & Rocket Launcher 
  8009ABBE 0101
                 
  Have PulseGun & Meatseeker    
  8009ABC0 0101
                 
 -Some Game Shark Codez: From: avidgamr@blueriver.net