Sonic Generations

Sonic Generations is a video game that was released in celebration of the 20th anniversary of the Sonic the Hedgehog series.

Plot
The story of the game revolves around Sonic as he and his classic counterpart race through areas from older Sonic games to free Sonic's friends and restore the worlds back to their original forms all while trying to figure out who brought them to the white limbo and how to get back to their corresponding time periods. Along the way, both classic and modern Sonic face Dr. Eggman in his previous attempts to destroy him.

Console/PC

 * Green Hill (from Sonic 1)
 * Chemical Plant (from Sonic 2)
 * Sky Sanctuary (from Sonic & Knuckles)
 * Speed Highway (from Sonic Adventure)
 * City Escape (from Sonic Adventure 2)
 * Seaside Hill (from Sonic Heroes)
 * Crisis City (from Sonic '06)
 * Rooftop Run (from Sonic Unleashed)
 * Planet Wisp (from Sonic Colors)

3DS

 * Green Hill Zone (from Sonic 1)
 * Casino Night (from Sonic 2)
 * Mushroom Hill (from Sonic & Knuckles)
 * Emerald Coast (from Sonic Adventure)
 * Radical Highway (from Sonic Adventure 2)
 * Water Palace (from Sonic Rush)
 * Tropical Resort (from Sonic Colors)

Console/PC

 * Death Egg Robot (from Sonic 2)
 * Perfect Chaos (from Sonic Adventure)
 * Egg Dragoon (from Sonic Unleashed)
 * Metal Sonic (from Sonic CD)
 * Shadow the Hedgehog (from Sonic Adventure 2)
 * Silver the Hedgehog (from Sonic '06)
 * Time Eater

3DS

 * Big Arm (from Sonic 3)
 * Biolizard (from Sonic Adventure 2)
 * Egg Emperor (from Sonic Heroes)
 * Metal Sonic (from Sonic CD)
 * Shadow the Hedgehog (from Sonic Adventure 2)
 * Silver the Hedgehog (from Sonic '06)
 * Time Eater

Playable

 * Sonic (Modern Sonic)
 * Sonic (Classical Sonic)
 * Super Sonic

Non Playable

 * Tails
 * Amy
 * Knuckles
 * Cream
 * Rouge
 * Espio
 * Shadow
 * Blaze
 * Vector
 * Charmy
 * Silver
 * Metal Sonic
 * Sonic Boom (series)