The 3DS and console versions have different levels, and share only the famous Green Hill Zone from Sonic 1. Their journey takes them through three eras: Classic, Dreamcast, and Modern. Both Modern and Classic must team up to stop this mysterious enemy, rescue their friends, restore color to the world, and fix the timeline. They both discover the world is losing its color, their friends have been petrified and the timeline has been disturbed. The story is that Modern Sonic and his friends are celebrating his birthday when a mysterious new enemy named 'Time Eater' crashes the party and sends them back to the past where Sonic meets his younger self, Classic Sonic. Both HD console versions and the 3DS version support stereoscopic 3D, though gamers without a 3D TV aren't required to use one to play the HD console versions as they can be played on any TV and the stereoscopic 3D on the 3DS version is not required to play the game properly and can be turned off, as it is typically used for visual effects on that version.

The 360/PS3/PC versions of the game utilizes both 2.5D (mostly in the 'Classic Sonic' sections) and a mix of 2.5D and 3D gameplay in the style of Sonic Colors Wii and Sonic Unleashed HD's daytime stages (in the 'Modern Sonic' sections), while the 3DS version's 'Modern Sonic' levels are stylistically similar to the Sonic Rush Series series and Sonic Colors DS. Sonic Generations is a main series title in the Sonic franchise, released in 2011 for the PlayStation 3, Xbox 360, the PC (via Steam) and the Nintendo 3DS to commemorate Sonic's 20th Anniversary. PAGES WILL BE DELETED OTHERWISE IF THEY ARE MISSING BASIC MARKUP. DON'T MAKE PAGES MANUALLY UNLESS A TEMPLATE IS BROKEN, AND REPORT IT THAT IS THE CASE. THIS SHOULD BE WORKING NOW, REPORT ANY ISSUES TO Janna2000, SelfCloak or RRabbit42. The Trope workshop specific templates can then be removed and it will be regarded as a regular trope page after being moved to the Main namespace.

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Sonic generations speed highway