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Expansion pack
Valve Corporation
Half-Life: Opposing Force
Half-Life (series)
Half-Life (video game)
Barney Calhoun
Gearbox Software
Gordon Freeman
Counter-Strike
Vortigaunt
Headcrab
Key terms:
game
blue shift
calhoun
pc
facility
xen
valve
black mesa
models
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rosenberg
sierra
opposing force
gearbox
software
video game
high definition pack
dreamcast version
marines
expansion pack
praised
freeman
location
gameplay
cancelled
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gearbox software
escape the facility
reviewer
barney calhoun
valve software
polygon
alien creatures
everything
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scientists
ign
laboratory
power cell
protagonist
through the game
accident
standalone
pc zone
valve corporation
critical
reception
portal
original game
Search external links cited by footnotes on Wikipedia page Half-Life: Blue Shift:
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