Since its inception, Tux Racer has seen unofficial forks and updates.[15] One of the most popular examples is Extreme Tux Racer, released in September 2007 and itself based on a previous fork, PlanetPenguin Racer.[16][17] An arcade version of the game was released by Roxor Games,[18] making it the first GPL-licensed video game to receive an arcade adaption.[11]