Codes
Pause the game and then do one of the following for the desired effect:

INVINCIBILITY
Press: Down, L2, Square, R1, Right, L1, Left, Circle.

X RAY VISION
Press: L1, R2, L2, R1, Right, Triangle, Cross, Right.

ALL MAP LINES
Press: Triangle, Triangle, L2, R2, L2, R2, R1, Square.

ALL MAP OBJECTIVES
Press: Triangle, Triangle,L2, R2, L2, R2, R1, Circle.

LEVEL WARP
Press: Right, Left, R2, R1, Triangle, L1, Circle, Cross.

ALL WEAPONS AND AMMO
Press: Cross, Triangle, L1, Up, Down, R2, Left, Left.

not sure if all of these work.

Here's the cheat page, so if anyone confirms these (never owned the game) you can drop 'em in for neopoints.

wow

I have found that all of the codes work except for the X-Ray vision one. I have tried that one over and over again, but it simply won't work.