Start the game with the -console command line parameter. Press ~ during game play to display the console window. Enter sv_cheats 1 at the console to enable cheat modes.

Code	Effect
impulse 101	All weapons
prop_debug	Bounding box debug
budda	Cannot die due to damage
hud_quickhelp/text? 1	Crosshairs on
hurtme < number >	Damage player by indicated amount
developer < 0-2 >	Developer mode
notarget	Enemies do not target you
god	God mode (Server only)
mat_numtexttureunits < number >	Limit texture units
map < map name >	Load indicated map
maps	Map list
noclip	No clipping mode
picker	Picker mode
exec < filename >	Run script file
air_density < number >	Set air density
sv_bounce < number >	Set bounce multiplier
dsp_explosion_effect_duration < number >	Set explosion length
sv_friction < number >	Set friction
sv_gravity < number >	Set gravity
sv_maxvelocity < number >	Set maximum velocity
sv_stopspeed < number >	Set minimum stopping speed
setang < number >	Set pitch yaw
sv_waterdist < number >	Set vertical view
give < weapon or item name >	Spawn indicated weapon or item
impulse 82	Spawn Jeep
npc_create_aimed	Spawn NPC
npc_create	Spawn NPC
showfps	Toggle framerate display
cl_drawhud < 0 or 1 >	Toggle HUD
cl_enablehud < 0 or 1 >	Toggle HUD