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# | Titel | Platform | Udvikler | Udgiver | Udgivelse | ||
---|---|---|---|---|---|---|---|
1. |
|
PC | Valve | Sierra | 1998 | ||
2. |
|
PC | Valve | VU Games | 2004 | ||
3. |
|
X360 | Turtle Rock | EA | 2008 | ||
4. |
|
PS1 | Tetragon | Virgin | 1997 | ||
5. |
|
PC | Valve | Valve | 2007 | ||
6. |
|
PC | Valve | Valve | 2011 |