The game follows Sonic the Hedgehog as a member of a resistance force against
Doctor Eggman, who has taken over the world with the help of his robot army and a
mysterious new villain known as Infinite. Gameplay is similar to Sonic Generations with
players controlling "Classic" and "Modern" versions of
the titular character; the former plays from a 2.5D side-scrolling view reminiscent of
the original Sonic games on the Sega Genesis, while the latter uses three-dimensional
gameplay similar to Sonic Unleashed and Sonic Colors. In addition to the two Sonics,
Sonic Forces also introduces a third gameplay mode featuring the
"Avatar", the player's own custom character.
