God
noclip
Give_weapon rpg
Give_weapon gauss
Give_weapon crowbar
Give_weapon crossbow
sv_gravity XXX {800 is default insert number here xxx}
Game Press The Tilde Key (Top Left Of Your Keyboard Under The ESC Key And Above TAB) And Type "sv_cheats 1" Then Press Enter. You Then Need To Load Another Game
DONT PRESS ENTER YET! Now on the end of this target adress type two space then type \"-dev\" and a another two spaces and then \"-console\" This should look like
D:\\Sierra\\Half-Life\\hl.exe -dev -console
Your hard drive might not be D so change it, it might be best to copy and paste that directly.
After you have created the new shortcut double click and use this to open half-life. Select your custom game, play/load a game as normal (not on internet unless enabled by server) and press the TLIDE key during play (the key left of the 1 key (`)) This will open up the console simply type in the following available cheats.
\"God\"
(god cheat enabled)
\"noclip\"
(fly around trough walls)
\"notarget\"
(enemies will ignore you but still kill the scientists and do their dirty deeds as usual)
\"impulse 101\"
(two spaces between that - enables all weapons and ammo and armour, wont need that if your in god mode!)
There are other MORE complicated cheats such as loading specific maps.
When you save the game the cheats opened will be enabled as you load.