Best-selling videogame modification
- Who
- Counter-Strike, Vivendi Universal, Microsoft Game Studios
- What
- First
- When
- 18 June 1999
Counter-Strike was originally a modification of Valve’s Half-Life game. It was first unveiled as a public beta on 18 June 1999 and went on to sell over 9 million retail copies worldwide on two different platforms (PC and Xbox).
A game mod is a modification to an original game made by members of the public.