Sid Meier's Alien Crossfire Login to rate this game Genres StrategyTurn-based strategy (TBS) Themes Science fiction4X (explore, expand, exploit, and exterminate) Modes Single playerMultiplayer Perspective Bird view / Isometric Developer Firaxis Games Publishers Electronic Arts, Aspyr Media Local co-op No Release dates Platform Date PC (Microsoft Windows) November 25, 1999 Mac May 15, 2000