Follow the steps below to access the following cheat codes:

Step 1 - First load the game with the hl.exe -toconsole command line.
Step 2 - Press F6 to display the console and type sv_cheats 1 to enable cheat mode.
Step 3 - Press ~ to close the console, then press F6 again to reload your game.
Step 4 - Press ~ and enter one of the following codes to access its corresponding cheat function.

Function - Code

God mode - /god
No clipping mode - /noclip
Map select - /map [map name]
Obtain item - /give [item name]

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

Map Name List:

Single Player -
o c0a0
o c0a0a
o c0a0b
o c0a0c
o c0a0d
o c0a0e
o c1a0
o c1a0a
o c1a0b
o c1a0c
o c1a0d
o c1a0e
o c1a1
o c1a1a
o c1a1b
o c1a1c
o c1a1d
o c1a1f
o c1a2
o c1a2a
o c1a2b
o c1a2c
o c1a2d
o c1a3
o c1a3a
o c1a3b
o c1a3c
o c1a3d
o c1a4
o c1a4b
o c1a4d
o c1a4e
o c1a4f
o c1a4g
o c1a4i
o c1a4j
o c1a4k
o c2a1
o c2a1a
o c2a1b
o c2a2
o c2a2a
o c2a2b1
o c2a2b2
o c2a2c
o c2a2d
o c2a2e
o c2a2f
o c2a2g
o c2a2h
o c2a3
o c2a3a
o c2a3b
o c2a3c
o c2a3d
o c2a3e
o c2a4
o c2a4a
o c2a4b
o c2a4c
o c2a4d
o c2a4e
o c2a4f
o c2a4g
o c2a5
o c2a5a
o c2a5b
o c2a5c
o c2a5d
o c2a5e
o c2a5f
o c2a5g
o c2a5w
o c2a5x
o c3a1
o c3a1a
o c3a1b
o c3a2
o c3a2a
o c3a2b
o c3a2c
o c3a2d
o c3a2e
o c3a2f
o c4a1
o c4a1a
o c4a1b
o c4a1c
o c4a1d
o c4a1e
o c4a1f
o c4a2
o c4a2a
o c4a2b
o c4a3
o c5a1
Multiplayer/Deathmatch -
o boot_camp
o bounce
o datacore
o lambda_bunker
o snark_pit
o stalkyard
o subtransit
o undertow
Hazard Course -
o t0a0
o t0a0a
o t0a0b
o t0a0b1
o t0a0b2
o t0a0c
o t0a0d

Load the game up from the MS-DOS window as HL.EXE -DEV. When the game loads, load a game or start a
new one and press ~ to open the console so ya can type in the cheats:

/GOD - God Mode
/NOCLIP - No Clipping