There is no definitive size to how big an independent game development studio might be. Several successful indie games, including "Axiom Verge", "Cave Story", "Papers, Please", and "Spelunky", were all developed by a single person, though often with support of artists and musicians for those assets. More common are small teams of developers, from two to a few dozen, with additional support from external artists. While it is possible for development teams to be larger, there becomes a higher cost overhead of running the studio, which may be risky if the game does not perform well.