Description
Half-Life: Opposing Force is the official game expansion for Half-Life, rated the "Game of 
the Year" by over 40 publications. In Opposing Force, players return to Black Mesa Research 
Facility to experience an entirely new episode of action. 
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Half-Life: Opposing Force is the official game expansion for Half-Life, the thrilling PC CDROM 
named "Game of the Year" by over 40 publications. In Opposing Force, players return to the 
Black Mesa Research Facility to experience an entirely new episode of single player action. 
In addition, Ops also contains a massive collection of new multiplayer content. Remember 
the soldiers who gave you so much trouble in Half-Life? Now you are one of them, and life 
is not so easy as part of the Opposing Force. As a soldier sent in to eliminate Gordon Freeman, 
you are separated from your base unit and discover a new alien race amidst the chaos. It's 
quickly revealed that these highly advanced alien life forms descended upon Earth to pillage 
the planet from the Black Mesa facility when Gordon Freeman transported to the border world of Xen

 
 
 
Cheat mode
Load the game using the “-CONSOLE –GAME GEARBOX” command line parameters. 
Your command line should look like this:
HL.EXE –CONSOLE –GAME GEARBOX
 

Press the tilde key [~] to activate cheat mode. 
All weapons and ammo
Enable Cheat mode. Then press [~] and enter “impulse 101” at the console window. 

Create item
Enable Cheat mode. Then press [~] and enter “give item” at the console window, where 
item is the object you wish to create. Example:

Give weapon_knife

Object list
 

Ammunition Ammo_556
Ammo_772

Weapons Weapon_displacer
Weapon_grapple
Weapon_knife
Weapon_pipewrench
Weapon_eagle
Weapon_M249
Weapon_Shockrifle
Weapon_Sniperrifle
Weapon_SporeLauncher

Disable clipping and flight modes
Enable Cheat mode. Then press [~] and enter “/noclip” at the console window. 

Invincibility
Enable Cheat mode, then press tilde [~] and enter "/god" at the console window.

Select level
Enable Cheat mode. Then press [~] and enter “/map name” at the console window, where 
name is one of the map names below.

Maps: 

Training
Ofboot1
Ofboot2
Ofboot3
Ofboot4

Regular game
Generally, single player maps have the following form:
of<0-7>a<0-5>letter

A few valid map map names are, “of0a0”, “of1a4b” and “of6a4”