Half-Life Cheats

Start Half-Life using "hl.exe -console".
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:

• /GOD - god mode.
• /NOCLIP - walk through walls/fly.
• /IMPULSE 101 - All weapons and most items
• /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 

Thanks to Gameaholic Dot Com for these cheats
Thanks to Ben "CaSh" for updating this cheat