Cheat List 
     On  the  inventory  screen press L1 + L2 + L3 + R1 + R2 + R3. You
need to do this each time before you try the following cheats:

Refill health                UP, DOWN, UP, DOWN, LEFT, RIGHT, LEFT,
                             RIGHT, X, CIRCLE. 
Refill armor                 SQUARE, CIRCLE, X, TRIANGLE, CIRCLE, SQUARE,
                             TRIANGLE, X, L3, R3. 
Unlock music video           LEFT, LEFT, LEFT, CIRCLE, CIRCLE, X, L1,
                             L1, R1, UP. 
Unlock credits               X, SQUARE, TRIANLGE, CIRCLE, RIGHT, UP, LEFT,
                             UP, X, UP. 
Max damage (rifle)           L3, L3, L3, SQUARE, TRIANGLE, CIRCLE, X, R3,
                             R3, R3. 
Max damage (pulse)           LEFT, RIGHT, CIRCLE, DOWN, LEFT, X, DOWN, UP,
                             X, TRIANGLE. 
Max damage (shotgun)         X, X, X, X, L3, R3, UP, DOWN, LEFT, RIGHT. 
Max damage (repeater)        LEFT, TRIANGLE, RIGHT, X, UP, SQUARE, DOWN,
                             CIRCLE, R3, L3. 
Max damage (assault)         LEFT, CIRCLE, RIGHT, SQUARE, DOWN, TRIANGLE,
                             UP, X, L3, R3. 
Max damage (bolt toss)       X, SQUARE, TRIANGLE, CIRCLE, X, CIRCLE,
                             TRIANGLE, SQUARE, X, UP.