Half-Life: Opposing Force (1999)
HL: OPFOR, HL: OP4, OP4, OPFOR, OP4, HL: OP4, OPFOR, HL: OPFOR
| Release Date: | 1999, November 10 |
| Alternative Titles: | HL: OPFOR, HL: OP4, OP4, OPFOR, OP4, HL: OP4, OPFOR, HL: OPFOR |
| Countries: | United States of America |
| Publishers: | Sierra Entertainment, Valve |
Description:
Storyline:
Keywords:
helicopter
bloody
death
run and gun
steam
online
artificial intelligence
easter egg
one-man army
boss fight
explosion
digital distribution
voice acting
human
polygonal 3d
original soundtrack release
wasd movement
profanity
sniping
melee
a.i. companion
difficulty level
vending machine interaction
team deathmatch
novint falcon support
darkness
particle system
assassin
non-player character
quicksaving
traps
scripted events
modern warfare
modern military
military
platform exclusive
vent crawling
severed limbs
aliens
nuclear bomb
doctor
mad scientist
quickloading
giant insects
corpse
scientist
interactive environments
missile launcher
insects
cheat code
gore
teleportation
silent protagonist
dimension travel
arrival by crash landing
worm
climbing
inconvenient malfunction
jumping puzzle
first-person platforming
soldier
alien invasion
player vs player
not-so-bad guys
gravity
shooting range
crash landing
alien languages
escaping imprisonment
time paradox
squad tactics
another world
zombies
grapple
training
alternative blood
pvp
text dialogue
valve anti-cheat
dedicated servers
capture the flag
strafe-jumping
death match
interactive achievement awards 2000
genetic experiment
buddy system