Die 'Half-Life'-Reihe

1. 

   Portal 2 (2011)

2. 

   Half Life 2 - The Orange Box (2007)

3. 

   Portal (2007)

4. 

   Half-Life 2: Episode One (2006)

5. 

   Half-Life 2 (2004)

6. 

   Half-Life 2: Episode Three (2008)

7. 

   Half-Life 2: Episode Two (2007)

8. 

   Team Fortress 2 (2007 / Addon)

9. 

   Garry's Mod (2006)

10. 

    Codename: Gordon (2004)

11. 

    Half-Life 2: Deathmatch (2004)

12. 

    Half-Life: Blue Shift (2001)

13. 

    Half-Life: Deathmatch Classic (2001)

14. 

    Gunman Chronicles (2000)

15. 

    Counter-Strike (1999)

16. 

    Half-Life: Opposing Force (1999 / Addon)

17. 

    Half-Life: Team Fortress Classic (1999)

18. 

    Half-Life (1998)