While the game is paused press L2, R2, L2(3 times), R2(3 times), Circle, Triangle, Square, Circle, Triangle, Square. If done correctly the ninja will turn into a skeleton and you will hear a chime. Just do the code again to change back.
Load a game and while Checking Memory Card appears, press L2, L2, R2, R2. You will now have a level select screen when the game starts. Also reported like this To activate this code remove your memory card and when the screen "checking memory card" appears quickly insert L2, L2, L2, R2, R2, R2 then you will see "dels level cheat on" appear if the code was inserted properly.
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