Half-Life is a popular series of first-person shooters developed by Valve Software.
- Half-Life
- Half-Life: Opposing Force
- Half-Life: Blue Shift
- Half-Life: Decay (released exclusively on PlayStation 2 by Gearbox Software)
- Half-Life 2
- Half-Life 2: Episode One (originally titled Half-Life 2: Aftermath)
- Half-Life 2: Episode Two