Spec Ops: Stealth Patrol Codes -

Cheat mode:
Enter ROCKSTAR as a name. Press Start to pause game play and enable the "Invulnerability" option. Press Left or Right at the mission selection screen to choose any mission and phase.

Glitch: Difficulty settings:
The programmers have the difficulties mixed up in the "Options" screen. Easy mode is supposed to be "Private", normal mode "Corporal" and hard mode "Sergeant". However, if you choose "Sergeant" you will get a much easier difficulty level. To set the difficulty correctly, use the following steps.

Easy: Go to "Options" and set the difficulty to "Sergeant".
Normal: Go to "Options" and set the difficulty to "Corporal".
Hard: Go to "Options" and set the difficulty to "Private".