All weapons:
Pause game play, then hold L and press Right, B(2), Y, B. A message will confirm correct code entry. Repeat the code to disable its effect. Note: Only weapons normally available in the current level will be unlocked.
Alternate fade:
Pause game play, then hold L and press Right, Up(2), Down, B. A message will confirm correct code entry. Repeat the code to disable its effect.
Alternate lighting:
Pause game play, then hold L and press Up, Right, Up, Down, B. A message will confirm correct code entry. Repeat the code to disable its effect.
Beagle holes, footprints, and burns:
Pause game play, then hold L and press Down, Up, B, Y, B. A message will confirm correct code entry. Repeat the code to disable its effect.
Fish Eye camera:
Pause game play, then hold L and press Left, Up, Right, Down, B. A message will confirm correct code entry. Repeat the code to disable its effect.
Invisible mode:
Pause game play, then hold L and press Up, Left, Right, Up, B. A message will confirm correct code entry. Repeat the code to disable its effect.
Level 2: Easy completion:
When the spotters see you, they will call in an air strike. After you kill the first spotter, hide under the bridge.
Slow-motion mode:
Pause game play, then hold L and press Left, Down, Up, Right, B. A message will confirm correct code entry. Repeat the code to disable its effect.