Cheat Codes:
Press?~?during game play to display the console window. Type?sv_cheats 1?to enable cheat mode. Then, then activate the following cheats by entering the corresponding codes:
CHEAT FUNCTION – CHEAT CODE
Invincibility – god
Invisibility – notarget
All weapons and ammunition – impulse 101
Fly and walk through walls – noclip
Draw your gun; can climb ledges you
cannot jump off while it is drawn – r_drawviewmodel 0