Cheat Codes
Start the game with the command-line parameter "-console" to enable the console. While playing, press [~] (tilde) to bring up the console and enter any of the following cheat codes:
Example: "C:\Program Files\Half-Life 2\hl2.exe" -console

NOTE: It may be necessary to use the code "sv_cheats 1" before entering other cheat codes into the system.

Code: Result:
god God Mode
impulse 101 All Weapons
notarget Enemies Ignore You
noclip No Clipping Mode
give [item] Give Item (See List)
map [mapname] Load Map (See List)
maps List Maps
buddha Reduce Health
infinite_aux_power Unlimited Power for Suit
hurtme # Damage Player (#=amount)
developer # Developer Mode (#=0,1,2)
impulse 82 Spawn a Jeep
impulse 102 Skulls
ch_createjeep Spawn a Scout Car
ch_createairboat Spawn an Airboat
npc_kill Kill All NPCs in Area
+mlook Enable Mouse Look
hud_quickhelp/text? 1 Show Crosshairs
viewmodel_fov # Sets Size of Carried Weapon
exec [file] Execute Script File
cl_drawhud 0/1 Show/Hide HUD
cl_enablehud 0/1 Show/Hide HUD
cl_showfps 0/1 Show/Hide FPS
npc_create Create NPC (See List)
npc_create_aimed Create NPC
picker Picker Mode
setpos [coordinates] Move to Position
setang # Set Pitch Yaw
sv_gravity # Set Gravity Value
sv_stopspeed # Set Minimum Stopping Speed
sv_friction # Set World Friction
sv_bounce # Set Bouce Multiplier
sv_maxvelocity # Set Maximum Velocity
sv_waterdist # Set Vertical View Fixup
air_density # Set Air Density
dsp_explosion_effect_duration # Set Length of Explosion
prop_debug Bounding Boxes Debug Mode
sv_soundemitter_filecheck Report Missing WAV Files
mat_numtexttureunits # Limit Texture Units
mat_yuv 0 Unknown Effect


Load Map: (use with the MAP [mapname] command)

d1_canals_01
d1_canals_02
d1_canals_end
d1_tempanals_02
d1_town_01
d1_town_02
d1_town_03
d1_town_04
d1_town_05
d1_trainstation_01
d1_trainstation_02
d1_trainstation_03
d1_trainstation_05
d1_under_01
d1_under_02
d1_under_03
d1_under_04
d2_coast_01
d2_coast_02
d2_coast_03
d2_coast_04
d2_coast_04_dx60
d2_coast_05
d2_coast_06
d2_coast_07
d2_coast_08
d2_prison_01
d2_prison_02
d2_prison_03
d2_prison_04
d2_prison_05
d3_c17_03
d3_c17_04
d3_c17_05
d3_c17_06a
d3_c17_06b
d3_c17_07

Give Weapons: (use with the GIVE [item] command)

weapon_ar1
weapon_ar2
weapon_bugbait
weapon_cguard
weapon_crowbar
weapon_extinguisher
weapon_flaregun
weapon_frag
weapon_gauss
weapon_iceaxe
weapon_physcannon
weapon_physgun
weapon_pistol
weapon_rpg
weapon_shotgun
weapon_smg1
weapon_smg2
weapon_stickylauncher
weapon_stunstick
weapon_thumper
weapon_sniperrifle
weapon_rollerwand
weapon_molotov
weapon_manhack
weapon_immolator
weapon_irifle
weapon_slam
weapon_hmg1
weapon_cubemap
weapon_binoculars
weapon_ml
weapon_brickbat

Give Items: (use with the GIVE [item] command)

item_box_buckshot
item_box_mrounds
item_box_sniper_rounds
item_box_srounds
item_healthkit
item_battery
item_suit
item_ml_grenade
item_ar2_grenade
item_healthvial

Spawn NPCs: (use with the npc_create command)
Proper usage is "npc_create npc_" plus any of the following names:

cscanner
rollermine
poisonzombie
mossman
monk
metropolice
manhack
launcher
kleiner
ichthyosaur
headcrab_poison
headcrab_black
headcrab_fast
headcrab
helicopter
gman
fastzombie
eli
dog
pigeon
seagull
crow
combine_s
combinegunship
combinedropship
citizen
breen
barney
barnacle
antlion
alyx
antlionguard
stalker
strider
vortigaunt
zombie
zombie_torso

Additional Command-Line Parameters
Use these additional parameters on your hl2.exe shortcut to activate the corresponding function.

Code: Result:
-width # -height # Set Width and Height of Window
-fullscreen Full Screen Mode
-heapsize # Set Heap Size
-r_anamorphic 0 Unknown Effect
-netgraph 3 Unknown Effect
-mat_preloadshaders Unknown Effect
-preload Unknown Effect
-dx9 Unknown Effect
-dxlevel 90 Unknown Effect
-mouselook Unknown Effect
-dx8 Unknown Effect
-sw Unknown Effect
-condebug Unknown Effect
-startwindowed Unknown Effect
-window Unknown Effect
-windowed Unknown Effect