Press Left, Circle, X, Right, Circle, X, Down,
Circle, X during game play. A cheats menu will 
appear with the following options: 

Invincible: No damage. 
Coords: Displays current position. 
Palmode: Switches NTSC to PAL, will freeze NTSC
         machines. 
Supermap: Display full map of current level. 
Maxout:All weapons and ammunition. 
Pogo: Higher jump to reach previously 
      inaccessible locations. 
Ponder: Turn AI off. 
Gamewon: Jump to next level. 

To use the level skip feature, enable the 
"Gamewon" option on the cheat menu. Resume 
playing and pause the game to access a new 
option to jump to the next level.