Syphon Filter

Codes

All weapons and unlimited ammo (PAL version)	Pause during play, then highlight the “weapons” option, then hold SELECT+L1+L2+R2+Circle+X. Note: Only the weapons available during the current level are selectable.
All weapons and infinite ammo	Press Start, highlight Weapons and press Right + L2 + R2 + Square + Circle + X
Hard Mode	At the New Game title screen press Left + L1 + R2 + Select + Square + Circle + X
Hard Mode (PAL version)	Highlight “New Game” at the title screen and hold L1+L2+R2+Square+Circle+X. Gabe will say “Damn it!” if it’s worked.
Level select (PAL version)	Pause during play, select “Options” and highlight “Select Mission”. Hold L1+L2+R1+Square+Circle+X. The entire list of levels should now appear.
One hit kills (PAL version)	Pause the game, highlight “Objectives” then hold Right+L1+R1+R2+Circle+X. Gabe will say “Understood” if it’s worked
One-Shot Kill	Pause the game, highlight Silenced 9mm and press Left + Select + Square + X + L1 + R2
Stage Select	Press Start, choose Options, then highlight Select Mission and press Left + L1 + R1 + Select + Square + X
Weak Enemies	Pause the game, highlight Map and press Right + L1 + R1 + X

They should work in all versions.
WARNING: use them wisely, and don’t use too many or the game might crash.