Sonic Forces (ソニックフォース Sonikku Fōsu) is a platform video game developed by Sonic Team and published by Sega. It was released on 7 November 2017 for PC, Nintendo Switch, PlayStation 4 and Xbox One. Sonic Forces follows Sonic as he joins a resistance force to take back the planet after Dr. Eggman's Eggman Empire took over 99% of it with the help of Eggman's henchmen, the Phantom Ruby, and a mysterious new villain known as Infinite. The story of the game also ties with Sonic Mania, released in the same year.
The game marks the return of the collaboration between both Classic Sonic and Modern Sonic since Sonic Generations, and in addition, Sonic Forces also introduces a third gameplay mode featuring the "Avatar", the player's own custom-created character. The game serves, along with Sonic Mania, as a celebration of Sonic series' 25th anniversary.