Related articles:
Valve Corporation
Half-Life (series)
G-Man (Half-Life)
Half-Life (video game)
Vortigaunt
Gearbox Software
Gordon Freeman
Headcrab
Key terms:
game
xen
black
opposing force
units
alien
player
shephard
race
gearbox
marines
valve
stated
review
escape
reach
noted
mode
black mesa
facility
combat
portal
video games
steam
variety
content
osprey
squad
expansion packs
black operations
sierra
multiplayer
pitchford
storage
freeman
shooter
concluded
encounters
commenting
security guard
perspective
original game
alien creatures
gearbox software
official website
extraction point
valve corporation
aspects of the game
black operations units
interactive achievement
Search external links cited by footnotes on Wikipedia page Half-Life: Opposing Force:
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