We have added two playthrough videos of both Classic and Modern versions of the Green Hill Zone from the upcoming Sonic Generations. Feel free to watch them using the links below and let us know what you think.
Here's the Classic Green Hill Playthrough - [showcase=sonicgenerationsclassicgreenhillplaythrough,Sonic Generations - Classic Green Hill Playthrough]http://www.youtube.com/v/zcObxik3f3U&feature=player_embedded[/showcase]
Here's the Modern Green Hill Playthrough - [showcase=sonicgenerationsmoderngreenhillplaythrough,Sonic Generations - Modern Green Hill Playthrough]http://www.youtube.com/v/OM9l43bhgt0&feature=player_embedded[/showcase]
Sources - GameTrailers