Half-Life: Opposing Force Codes -

Cheat Mode:
Load game with the hl.exe -dev -console -game gearbox command line. Press ~ during game play and enter one of the following console commands to activate the corresponding cheat function

Effect	Code
All weapons and ammunition	impulse 101
God mode	/god
No clipping and flight modes	/noclip
Level select	/map <map name>
Spawn indicated item	/give <item name>
Spawn indicated weapon	/give weapon_<weapon name>
Spawn indicated ammo	/give ammo_<ammo name>
Auto-reload enabled	+reload
Auto-reload disabled	-reload
Adjust gravity	sv_gravity <-999 - 999999>

Weapon names:
Use one of the following weapon names with the /give weapon_ code.

Weapon	Weapon name
.357 Magnum	357
9mm Assault Rifle	9mmar
9mm Handgun	9mmhandgun
Crossbow	crossbow
Crowbar	crowbar
Desert Eagle	eagle
Displacer	displacer
Egon Gun	egon
Gauss Gun	gauss
Grapple	grapple
Hand Granate	handgrenade
Hornet Gun	hornetgun
Knife	knife
Laser Tripmine	tripmine
M249 SAW	m249
M40A Sniper Rifle	sniperrifle
Pipewrench	pipewrench
Rocket Thrower	rpg
Satchel Charge	satchel
Shock Rifle	shockrifle
Shotgun	shotgun
Snark	snark
Spore Launcher	sporelauncher

Ammo names:
Use one of the following ammo names with the /give ammo_ code.

Ammo type	Ammo name
.357 Magnum	357
9mm Assault Rifle	9mm
9mm Handgun	9mm
Crossbow	crossbow
Egon Gun	egonclip
Gauss Gun	gaussclip
M249 SAW	556
M40A Sniper Rifle	762
Rocket Thrower	rpgclip
Shotgun	buckshot
Spore Launcher	spore

Original levels:
You can play all the Half-Life levels that Gordon Freeman went through as Adrion Shepard, but in the lab none of the scientists will talk to you.

Hidden audio:
Approach the Boss of Opposing Force to hear backwards audio composed of the phrase "To win the game you must kill me Randy Pitchford" when played correctly. Randy Pitchford is the leader of the development team at Gearbox Software.

Hint: Get a gun at the beginning of the level:
At the beginning of the level where you reach the security guard, find a chair. It is easily moved. Move it to the door that he will open for you, and get him to open it. Slide the chair in between the doors, and it will not close. This may take a few tries. Go out, take the crowbar, charge it up until you reach the same security guard, and hit him until he explodes. Then, get his pistol with the laser sight and continue the game.

Hint: Spawn Grunts:
Enable cheat mode, then use the impulse 76 code to activate the Grunt-O-Matic. A message to start a new game in order for it to work will appear. If you want to continue where you currently are, just quicksave, then quickload the game. Once you have quickloaded, type in the code again to spawn a Grunt. Note: You must have the /noclip code on before you spawn the grunt because he will be spawned close to you. If this is not done, a message stating that the monster spawned is stuck in a wall may appear and the game will end. Do not spawn the Grunt in a closed position or the same message will appear. The Grunt you spawn will see you as a hostile. To have more fun, use the /notarget code and spawn a number of grunts to do your alien hunting. The Grunts you spawn will look like the Grunts from the original Half-Life.

Hint: Killing Gordon Freeman:
Go to the map named "of3a1". This is the map where you see Freeman running into the teleporter. Follow him into that same teleporter. After the map is done loading, you will see yourself falling. Normally, if you let yourself fall the game will restart at map "of3a1". However, if you enable the /noclip and go to the nearest platform in front of you, Gordon Freeman will appear. Gordon just stands there with no weapons, and wears silver sunglasses. It takes some time to kill him with just bullets -- try grenades or a very powerful weapon. Alternately, you can go to this location enabling the map of3a1b code.

Hint: Redo the sniper course:
During boot camp, shoot the trainer and you will start again at the beginning of the course.