To celebrate his 20th anniversary, SEGA has unveiled details on Sonic Generations (PS3/360). The basics: you can play as either classic Sonic or modern Sonic, each with their own movesets and paths through levels spanning the hedgehog’s game series.

Classic Sonic can’t do the “run into the screen” bits, he’s strictly 2D, while Modern Sonic goes between 2D and 3D, on different paths. It’s very likely this is the Sonic Colors team , which means it should be good, unlike the disaster that is Sonic 4. A new mechanic to the series is Joe Danger style gates that move you in or out between one of the 3 various layers you can run on, so like LittleBigPlanet but not as sucky. This provides parallel paths for Modern and Classic Sonic.

You can see the trailer, some screenshots and more information after the break.

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Press Release from SEGA:

SEGA® America, Inc. and SEGA® Europe Ltd., today announced details of Sonic Generations™, the highly anticipated video game title in development to celebrate Sonic the Hedgehog’s 20th Anniversary. Delivering the definitive gaming experience for Sonic fans old and new, Sonic Generations™ sees Sonic the Hedgehog playable as both the much loved classic 1991 character, and the modern day video game hero he has become in this exciting new fast paced adventure. Sonic Generations™ will speed into stores for the Xbox 360® video game and entertainment system from Microsoft and PlayStation®3 computer entertainment system for Holiday 2011.

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. Each incarnation of Sonic in Sonic Generations comes complete with his trademark special move, Spin Dash and Spin Attack for Classic Sonic, and the Homing Attack and Sonic Boost for Modern Sonic. An innovative new interactive menu system allows for complete immersion in Sonic’s universe with favorite characters and hidden treasures gradually being revealed throughout the game.

“Sonic Generations will certainly be a fitting celebration for Sonic’s 20th Anniversary,” commented David Corless, Global Brand Director for Sonic. “By having the classic 1991 Sonic that many fans know and love team up with his modern day incarnation, we are bringing back the nostalgia of the early days of Sonic and combining it with the innovation and stunning HD technology of the modern gaming era. Sonic Generations will bring to life the last twenty years of Sonic’s universe in a truly unique and imaginative way.”

Sonic’s universe is thrown into chaos when a mysterious new power creates ‘time holes’ which pull him and his friends back through time. As a result, he encounters some surprises from his past history including Classic Sonic, Sonic as he was in 1991. Modern Sonic and Classic Sonic must defeat this strange new enemy, save their friends, and find out who really is behind this diabolical deed…

For more information about the game, please visit www.sega.com/sonicgenerations
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