Pause the game and then enter the following

All Weapons

X,Triangle,L1,Up,Down,R2,Left,Left
Submitted by codeman10

Complete Map

Triangle,Triangle,L2,R2,L2,R2,R1,Square
Submitted by codeman10

Invincbilty

Down,L2,Square,R1,Right,L1,Left,Circle
Submitted by codeman10

WARP!

Right,Left,R2,R1,Triangle,L1,Circle,X
Submitted by codeman10

X-Ray

L1,R2,L2,R1,Right,Triangle,X,Right
Submitted by codeman10

Items On Map

Triangle,Triangle,L2,R2,L2,R2,R1,Circle