2D Sonic

Gameplay

 * Boost formula but in 2D.
 * Heroes team mechanics.
 * Less automation and more "speed-focused platforming".
 * Flight segments are like high speed shoot 'em up segments, while Power segments involve more puzzle-oriented gameplay to clear a path.

Team Sonic

 * Consists of Sonic, Tails, and Knuckles.
 * Eggman has taken over an island and is churning out robots, so Sonic, Tails, and Knuckles go after him.
 * The most basic team in terms of levels.

Team Dark

 * Consists of Shadow, Rouge, and E-123 Omega.
 * E-series robots and Shadow Androids seem to be invading all over the world, and Omega is receiving signals that indicate why. Strangely, it has nothing to do with Eggman.
 * More combat-oriented levels.

Team Rose

 * Consists of Amy, Cream, and Big.
 * A Chao outbreak has occured and Cream urges Amy and Big to help her.
 * More traditional platforming.

Team Chaotix

 * Consists of Vector, Espio, and Charmy.
 * The trio take on multiple cases in various areas.
 * More mazelike levels, as well as collecting.

Team Outcasts

 * Consists of Silver, Mighty, and Ray.
 * Mighty and Ray are a duo of treasure hunters who stumble upon an artifact. Silver comes from the future to warn them, but is too late as the trio are sent hurdling through time and have to make their way back.
 * More levels focused around searching for an exit.

Team Rogues

 * Consists of Jet, Wave, and Storm.
 * The trio are out looking for things to steal.
 * Most of their levels have time limits.

Team Spirits

 * Consists of Marine, Blaze, and Tikal.
 * Infinite comes after the Master Emerald, causing Tikal's awakening. Blaze and Marine happen to be in pursuit, and the trio decide to follow Infinite.
 * Unorthodox level design and the use of momentum.