Console cheats
Open the cheat console window by pressing ~ (or the key above Tab), then enter con_restricted 0 and hit Enter. Now you can enter the following cheats for the desired effect:
- g_godMode = 1 - God mode
- g_infiniteAmmo = 1 or i_unlimitedammo = 1 - Unlimited ammo
- g_infinitesuitenergy=1 - Unlimited Suit Energy