Freedom Planet is a 2D platform video game developed and published by American video game designer Sabrina DiDuro, for her studio GalaxyTrail. The player controls one of three anthropomorphic animal protagonists: the dragon girl Lilac, the wildcat Carol, or the basset hound Milla. Aided by a duck-like alien named Torque, the girls attempt to defeat the evil Lord Brevon, who plans to steal the Kingdom Stone and conquer the galaxy. While the game focuses on fast-paced platforming, its levels are interspersed with slower action scenes. DiDuro first began developing Freedom Planet as a Sonic the Hedgehog fangame using characters created by DeviantArt user Ziyo Ling for its main cast. Early into development, she lost interest in creating a derivative work and reconceived the project as her own intellectual property. Sash Lilac, originally a hedgehog, became a dragon; antagonist Doctor Eggman was replaced by Lord Brevon with his eyebrows resembling Doctor Eggman's mustache; and the Sonic series' ring-based health system was abandoned. Further changes were suggested by fans and incorporated throughout development. Freedom Planet was developed in Denmark and the United States, with its art direction carrying East Asian influences, such as medieval Chinese art inspiring its background visuals. With development focused on the Microsoft Windows platform, the game started out as a demo first released in August 2012 and was, after a successful Kickstarter campaign, released in its entirety via Steam in July 2014. Freedom Planet was later released on the Wii U in October 2015, on the PlayStation 4 in 2017, and on the Nintendo Switch in August 2018. The game received largely positive reviews; critics praised its gameplay, visuals, music, aesthetics, sense of humor and balance of Sonic elements with original content, but were mixed on its pacing, voice acting, story and the abundance of long cutscenes. A sequel, Freedom Planet 2, was released on September 13, 2022 on Windows. Ports for the Nintendo Switch, PlayStation 4, PlayStation 5, Xbox One and Xbox Series X/S, will follow in 2023.