Enter at Credits
Infinite Life
L1, Triangle, Up, Down, Circle(2), Triangle, Square, Right, Square.
Maximum ammo
L1, Triangle, Up, Down, Circle(2), Triangle, Square, Left, Triangle
Instant death with Guns
L1, Triangle, Up, Down, Circle(2), Triangle, Square, Down, R1
Instant puzzle solution
L1, Triangle, Up, Down, Circle(2), Down(3), Up.
Expert mode
Down(3), Triangle, Down(3), Square, Left, Right
credit:any code site I got em of one of em the same are at cdcovers.cc gamewinners.com cheatcc.com and many others. I think i found these at cdcovers.cc