During play, hold L2 R2 and press Square, Triangle, Circle, Circle, Start.

View Rogue Trip FMV sequence

While you are at the GT Interactive logo during the opening sequence, press L1, L2, R1, R2.

Cheats

Enter the following codes for the function you want

Code.............................................................................................What happens

Down(9x), Up..................................................................................Level select
L2, R1, L1, R2, Up, Down, Up, Down, Select(2x)................................Invincibility
[Left, Right, Left, Right, Select] 2x.....................................................Infinite ammo
L1, L2, Up, L1, L2, Down, R1, Right, R2, Left....................................All weapons
R1(5x), L2(5x).................................................................................All items
Up, Right, Up, Left, Down, Up, Right, Left, Right, Down......................All keys