HALF LIFE CHEATS

PC

Cheat mode:
Load the game with the hl.exe -toconsole command line. Press [F6] to load the last quick saved game. Press ~ to display the console and type sv_cheats 1 to enable cheat mode. Press ~ to close the console, then press [F6] again to reload. Press ~ and enter one of the following console commands to activate the corresponding cheat function. Note: Load the game with the hl.exe -dev -toconsole command line when using the /give (obtain item) cheat.

Effect - Code
God mode. - /god
No clipping mode - /noclip
Opponents ignore character - /notarget
All weapons and ammo - impulse 101
Map select1 - /map <map name>
Obtain item2 - /give <item name>

1. Select a map name from the following list.
2. Select an item name from the following list.

Map name list:
Single player
c0a0
c0a0a
c0a0b
c0a0c
c0a0d
c0a0e
c1a0
c1a0a
c1a0b
c1a0c
c1a0d
c1a0e
c1a1
c1a1a
c1a1b
c1a1c
c1a1d
c1a1f
c1a2
c1a2a
c1a2b
c1a2c
c1a2d
c1a3
c1a3a
c1a3b
c1a3c
c1a3d
c1a4
c1a4b
c1a4d
c1a4e
c1a4f
c1a4g
c1a4i
c1a4j
c1a4k
c2a1
c2a1a
c2a1b
c2a2
c2a2a
c2a2b1
c2a2b2
c2a2c
c2a2d
c2a2e
c2a2f
c2a2g
c2a2h
c2a3
c2a3a
c2a3b
c2a3c
c2a3d
c2a3e
c2a4
c2a4a
c2a4b
c2a4c
c2a4d
c2a4e
c2a4f
c2a4g
c2a5
c2a5a
c2a5b
c2a5c
c2a5d
c2a5e
c2a5f
c2a5g
c2a5w
c2a5x
c3a1
c3a1a
c3a1b
c3a2
c3a2a
c3a2b
c3a2c
c3a2d
c3a2e
c3a2f
c4a1
c4a1a
c4a1b
c4a1c
c4a1d
c4a1e
c4a1f
c4a2
c4a2a
c4a2b
c4a3
c5a1

Multiplayer/Deathmatch
boot_camp
bounce
datacore
lambda_bunker
snark_pit
stalkyard
subtransit
undertow
Hazard course
t0a0
t0a0a
t0a0b
t0a0b1
t0a0b2
t0a0c
t0a0d

Item name list:
item_airtank
item_antidote
item_battery
item_healthkit
item_longjump
item_security
item_sodacan
item_suit
ammo_357
ammo_9mmAR
ammo_9mmbox
ammo_9mmclip
ammo_ARgrenades
ammo_buckshot
ammo_crossbow
ammo_egonclip
ammo_gaussclip
ammo_glockclip
ammo_mp5clip
ammo_mp5grenades
ammo_rpgclip
weapon_357
weapon_9mmAR
weapon_9mmhandgun
weapon_crossbow
weapon_crowbar
weapon_egon
weapon_gauss
weapon_glock
weapon_handgrenade
weapon_hornetgun
weapon_mp5
weapon_python
weapon_rpg
weapon_satchel
weapon_shotgun
weapon_snark
weapon_tripmine
weapon_quantumdestabilizer
Hint: Starting tips:
After the "accident", you will discover a scientist giving CPR to a security guard. Wait 15 to 20 seconds to see the outcome, which usually results in the security guard being revived. He is not useful at this time, but return to him after getting the crowbar. Kill him with the crowbar so he can not fire back to get his gun and ammunition.
Soon after this, you will ride an elevator upward. Have the gun ready. Shoot the monster attacking the security guard; a couple of shots should do it. This security guard can cover you until you reach the main entrance area.
One important tactic in the early game is to use your "allies" to your advantage. When you no longer require the services of a security guard, kill him and take his ammunition. A scientist is also useful in drawing enemy attack. Be careful not to harm an ally when another security guard is present, as he will attack you. Also be aware that monsters can sense your allies; and even if you crawl, monsters can hear your allies' walk.
The beginning of the game also has the following glitch. There is a scientist sitting in front of a damaged instrument panel, in the area of the first scientist who opened a door for you. This scientist is invincible. You can shoot or beat him with a crowbar, and all he will do is whine. This also saturates the area with a large amount of blood.

HALF LIFE CHEATS

PS2

Invincibility:
At the cheat screen press Left, Square, Up, Triangle, Right, Circle, Down, X.
 
Slow motion mode:
At the cheat screen press Right, Square, Up, Triangle, Right, Square, Up, Triangle.
 
Invisibility:
At the cheat screen press Left, Square, Right, Circle, Left, Square, Right, Circle.
 
Low gravity:
At the cheat screen press Up, Triangle, Down, X, Up, Triangle, Down, X.