Related terms:
blue shift
opposing force
valve software
black mesa
valve corporation
high definition pack
alien creatures
black mesa research facility
xen
gordon freeman
sierra entertainment
source engine
shephard
security guard
single player
original game
expansion pack
calhoun
rosenberg
freeman
sierra
marines
shooter
Wikipedia sources:
Gearbox Software
Half-Life (series)
GoldSrc
Halo: Combat Evolved
Half-Life (video game)
Half-Life: Decay
Aliens: Colonial Marines
Half-Life: Blue Shift
Half-Life: Opposing Force
Context for words:
gearbox
software
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