Half-Life

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.
/MAP xxxx - go to map xxxx. Map names are of the format c#a#,
(c1a1, c2a1, etc).
See the map list for names of all levels.
/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_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

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