Silicon Ice Development / Frozen Sand, LLC License proprietary (mod and data), GNU GPL (engine) Engine id Tech 3 Version 4.1 (2007-12-22) Platform(s) Macintosh , PC ( Linux / Windows ) Release date(s) August 5 , 2000 (Beta 1.0) Genre(s) First-person shooter Mode(s) Multiplayer Rating(s) OFLC : MA15+ [ citation needed