Whilst in the game press the tilde key (~) to drop down the console and enter the following cheats to activate the corresponding cheat function:

• allammo - Full ammo for all weapons.
• behindview 0 - First person view.
• behindview 1 - Third person view.
• FOV (n) - Change the view. Replace (n) with any number (default view is 70).
• God - God mode
• Ghost - No clipping/free fly
• Walk - Disable Ghost cheat.
• Loaded - All weapons.
• Slomo (n) - Change game speed. Replace (n) with any number.
• suicide - Kill yourself.