Fan-made Sonic Generations wallpaper AND GH 3rd Mission gameplay! *Spoilers*
The WallPaper. Feel free to print it and put it on your wall!
Hero and Sidekick, Present and Past.
I don't even know what to say about this one. This one's a big wallpaper!
SPOILER ALERT! Green Hill 3rd Mission gameplay(incomplete)
http://www.dailymotion.com/video/xlmcvh_sonic-generations-demo-vs-knuckles-mission_videogames