How old is GMod?

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Tags

1. #release
2. #studios
3. #standalone
4. #november
5. #newman
6. #commonly
7. #windows
8. #created
9. #facepunch
10. #microsoft
11. #valve
12. #developed
13. #garry
14. #published
15. #later
16. #physics
17. #corporation
18. #abbreviated
19. #originally
20. #sandbox