Half-Life games in order

All 12 games of the Half-Life series in the order they came out, from Half-Life (1998) to Half-Life: Alyx (2020).

1. 
   Half-LifePC, PS2, Mac +1 · Valve Corporation
   9619 Nov
2. 
   Half-Life: Opposing ForcePC, Mac, Linux · Gearbox Software
   8010 Nov
3. 
   Half-Life: Blue ShiftPC, Mac, Linux · Gearbox Software
   7312 Jun
4. 
   Half-Life: DecayPS2 · Valve Corporation, Gearbox Software
   6814 Nov
5. 
   Half-Life: SourcePC, Mac, Linux · Valve Corporation
   671 Jun
6. 
   Half-Life 2PC, Xbox, Xbox 360 +4 · Valve Corporation
   9616 Nov
7. 
   Half-Life 2: DeathmatchPC, Mac, Linux · Valve Corporation
   7530 Nov
8. 
   Half-Life 2: Lost CoastPC, Linux, Mac · Valve Corporation
   6727 Oct
9. 
   Half-Life 2: Episode OnePC, Xbox 360, PS3 +2 · Valve Corporation
   871 Jun
10. 
    Half-Life 2: SurvivorArcade · Valve Corporation, Taito
    28 Jun
11. 
    Half-Life 2: Episode TwoXbox 360, PC, PS3 +2 · Valve Corporation
    909 Oct
12. 
    Half-Life: AlyxPC, Linux, SteamVR · Valve Corporation, Campo Santo
    9323 Mar