Activating this trainer:

Press F1 at main menu.

Listen for 'Trainer Activated'.

Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options:

F1: God Mode

F2: Unlimited Ammo

F3: Fast Movement

F4: Walk Through Walls Ghost Mode

F5: Walk Through Walls Ghost Mode Off

Notes:

The trainer, when activated, allows you to use the following console commands without the 'CHEATING' flag, and also achievements will occur.

To use these, wait until you are in the game and controlling Sam, then press the tilde key (~) to open the console, then press one of the following option keys, then press ENTER to activate it, then press the tilde key (~) to close the console. ENJOY!