Half-Life
1) To input the cheats you have to enable the console interface in the single player game.
To do this, you make a shortcut of HL.EXE, and then add "-dev -toconsole" to the
command line. Start Half-Life with this shortcut. 

2) Half-Life will load directly to the console interface, bypassing the opening flash screens.
If you already have a quick-saved game, hit the F7 key. If you are starting a new game type
"map c0a0" into the console to start with the train ride introduction, or "map c1a0" to start
after the train ride introduction. 

3) The console is now active in single player mode and you can input the cheats. Intro.
Standard Quake cheats such as "god" "fly" "noclip" and "notarget" are available including
the Half-Life-specific below: 

To enable a cheat, type "/give weapon_shotgun" for example. 

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 
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