Valheim is an upcoming survival and sandbox video game by the Swedish developer Iron Gate Studio and published by Coffee Stain Studios. It was released in early access on 2 February 2021 for Linux and Windows via Steam, and for Xbox One and Xbox Series X/S on 14 March 2023. The game was developed by a five-person team, building on development work which Richard Svensson had undertaken as a side project in his spare time. Since its early access release, Valheim has achieved both critical and commercial success, being praised as a "rare exception" of a refined early access game. A month after its release, it had sold over five million copies and was one of the most played games on Steam.