Sonic Forces is a 2017 platform game developed by Sonic Team and published by Sega. Produced in commemoration of the 25th anniversary of the Sonic the Hedgehog franchise, it was released for Microsoft Windows, Nintendo Switch, PlayStation 4, and Xbox One in November 2017. The story sees Sonic the Hedgehog joining a resistance force to stop Doctor Eggman, who has conquered the world alongside new villain Infinite. It features three gameplay modes: "Classic", side-scrolling gameplay similar to the original Sega Genesis Sonic games; "Modern", 3D gameplay similar to Sonic Unleashed and Sonic Colors; and a mode featuring the "Avatar", the player's custom character.