Half-Life games in order

In release order

1. 
   Half-Life1998 · rated 84 · 12 h to beat
2. 
   Half-Life: Uplink1999 · PS2 · rated 79
3. 
   Counter-Strike2000 · rated 77 · 15 h to beat
4. 
   Codename: Gordon2004 · rated 70
5. 
   Half-Life: Source2004 · rated 67 · 13.2 h to beat
6. 
   Half-Life 22004 · Xbox, PS3, Xbox 360 · rated 85 · 13.5 h to beat
7. 
   Half-Life 2: Deathmatch2004 · rated 75
8. 
   Half-Life 2: Lost Coast2005 · rated 67 · 1 h to beat
9. 
   Half-Life Deathmatch: Source2006 · rated 69
10. 
    Guard Duty2019 · PS4, Switch, Vita · rated 79
11. 
    Black Mesa2020 · rated 88 · 10.7 h to beat
12. 
    Half-Life: Alyx2020 · rated 93 · 14 h to beat

Top rated

Half-Life: Alyx202093 rating · 14 h to beatBlack Mesa202088 rating · 10.7 h to beatHalf-Life 22004 · Xbox, PS3, Xbox 36085 rating · 13.5 h to beatHalf-Life199884 rating · 12 h to beatHalf-Life: Uplink1999 · PS279 ratingGuard Duty2019 · PS4, Switch, Vita79 ratingCounter-Strike200077 rating · 15 h to beatHalf-Life 2: Deathmatch200475 rating