All Weapons, Full Ammo, and Full Health

Enter the following cheats while the game is paused.

Note: You can do these cheats a limited number of times.

All Weapons: Press X, Tri, R2, Tri, X, L2, R2, Down, L2, Square, Right.
Full Ammo: Press Left, Left, L1, R2, Square, R1, Right, Right.
Full Health: Press L2, L2, R2, R2, Up, L1, Up, R1.