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When you complete this cheat you'll have the chance to do it
all again with infinite ammo and all the weapons but if you like
taking advantage of these bonuses a little earlier you can go into
your inventory screen and enter the following code:
L1, Triangle, L2, R2, R2, L2, O and L1.
Level Skip:
Enter the following code on the inventory screen:
L2, R2, Triangle, L1, L1, O, R2, L2.
All Weapons and Ammo:
Enter this code on the inventory screen, then go back to the game
before checking out your brand new inventory:
L1, Triangle, R2, L2, L2, R2, Circle, L1(US/NTSC version)
L1, Triangle, L2, R2, R2, L2, Circle, L1(PAL version)