Press tilde while playing to get your console, then type in the following cheat codes.
Effect | Code
|
---|
All Weapons+Ammo | sv_everything_1
|
Demon Mode | sv_demon_1
|
Finish the level at 100% | sv_perfect_finish_1
|
God Mode | sv_cheat_godmode_1
|
Max ammo | sv_max_ammo_1
|
Max Health | sv_max_health_1
|