Set across three defining eras from 20 years of Sonic the Hedgehog video game history, the instantly recognizable environments of Sonic Generations have been re-built in stunning HD and are now playable in both classic side scrolling 2D from 1991, as well as modern 3D style found in Sonic's most recent adventures.Amazon.comSonic Generations is a single player Action Platforming game that blends 20 years of the adventures of Sega's iconic video game hedgehog into a single release not to be missed by longtime and new fans alike. Travel through time, sprinting through side-scrolling levels on a race for rings as you play as either the modern version of Sonic or one inspired by classic game releases on Sega specific gaming consoles from the past. Additional features include: levels inspired by Sonic games releases stretching back to 1991, the ability to play as either version of Sonic, release specific power-ups and moves, infamous Sonic bosses and rivals, side missions, unlockable content and compatibility with 3D TVs.Celebrate the 20th Anniversary of the Sonic video game franchise with a time altering adventure like no other. Double the Sonic Means Double the AdventureSonic Generations is the ultimate celebration of 20 years in Sonic gaming, delivering the definitive gaming experience for Sonic fans new and experienced. In Sonic Generations Sonic's birthday and universe is thrown into chaos when a mysterious new power reveals itself, creating 'time holes' which take Sonic and his friends back in time. While there, Sonic runs into some very familiar characters from his past including a younger, classic version of himself. Together these two Sonics must defeat their enemies, save their friends, and find out who is behind this diabolical deed. The game features levels inspired by all three console based eras of Sonic  gameplay: classic Sega Genesis, Dreamcast and the modern game consoles of today. All of these are presented in crystal-clear HD, and are playable on 3D TVs. As you travel through Sonic's history elements such as attacks, available power-ups and other features remain consistent with franchise gameplay history as well, with the main difference being that players have the ability to choose which version of Sonic they would like to play as.Key Game FeaturesTwice the Fun - Play as both Classic Sonic and Modern Sonic in the ultimate Sonic experience. Master the moves of each character as they race through each environment on their own specially designed track.The Best Just Got Better - Iconic environments from gaming history come to life in beautiful HD for the ultimate Sonic adventure, each revisited, recreated and re-imagined with stunning results. Also, these environments are presented in stunning new stereoscopic 3D for a whole new way to play.Unlock New Adventures - Once you complete each level and 'free' Sonic's captured friends, you'll get to go back and take on more challenges with them at your side.Infamous Bosses and Rivals - Take on some of the most notorious characters from Sonic's past as you fight for ultimate supremacy.Master Your Moves - Master Classic Sonic  moves like his famous Spin Dash and Spin Attack, and utilize Modern Sonic's 'Sonic Boost' as you complete the all new tracks.Additional ScreenshotsTravel back in time. Play as classic or modern Sonic. Face classic bosses and rivals. Classic and unique power-ups.