Half-Life 
                        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