Half-Life series
Half-Life is a series of predominantly single-player FPS games.
Valve titles
The Half-Life series consists of the following Valve-developed titles:
Half-Life (
)
Half-Life: Uplink ()
Half-Life 2 (
)
Half-Life 2: Deathmatch ()
Half-Life 2: Lost Coast ()
Half-Life 2: Episode One ()
Half-Life 2: Episode Two ()
Half-Life: Alyx (
)
Licensed titles
The following titles developed either primarily or entirely by external studios, but are officially licensed by Valve:
Half-Life: Opposing Force ()
Half-Life: Blue Shift ()
Half-Life: Decay ()
Codename: Gordon (
)
Half-Life 2: Survivor (, Arcade)
Related titles
Additionally, the following titles are tangentially connected to the Half-Life franchise:
Team Fortress Classic ()
Half-Life: Counter-Strike ()
Deathmatch Classic ()- The
Portal series ( and )
Fangames
There are also many mods and fangames which take place in the Half-Life franchise, such as 
Black Mesa, 
Entropy : Zero 2, and 
Hunt Down the Freeman.
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