Psyonix LLC is an American video game developer based in San Diego. It was founded in 2000 by Dave Hagewood with the team of his Internet-focused company WebSite Machines. After canceling its first two projects, Psyonix created VehicleMOD, a mod that adds vehicles to Unreal Tournament 2003. The game's developer, Epic Games, subsequently hired the studio to recreate this gameplay for a game mode in Unreal Tournament 2004. Psyonix subsisted off contract work and released its first original game, Supersonic Acrobatic Rocket-Powered Battle-Cars, in 2008. The game was not as successful as anticipated but Hagewood held on to the game's concept and had a small team prototype a sequel while the rest of the company worked on further contract projects. This sequel was released as Rocket League in 2015 and became a commercial success. Epic Games acquired the studio in May 2019.