Start Half-Life using "hl.exe -console".
                  You may do this by modifying the windows shortcut properties
                  for Half-Life and adding "-console" to the end of the "Target"
                  (or file to run).
                  The /GIVE command works if you start the game with the -dev
                  -console parameter, and that the God mode cheat and map change
                  cheat only work with the -console parameter.
                  This will let you access the console using "~" key.

                  You may have to type "sv_cheats 1" in console first.
                  The following commands are available in console:

                  IMPULSE 101 - Give all weapons and ammo.
                  /GOD - god mode.

                  /NOCLIP - walk through walls/fly.

                  /MAP xxxx - go to map xxxx. Here's the maplist:
                  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

                  /GIVE xxxx - give item xxxx. The following items are
                  available:
                  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