The First 15 Minutes of Sonic Mega Collection: Sonic 3D Blast (GameCube)

Copied from MobyGames:While visiting Flicky Island, Sonic notices that the Flickies, his small, feathered friends that can travel between parallel worlds, were captured and turned into badniks by Dr. Robotnik in his never-ending quest for the Chaos Emeralds. Seven levels separate Sonic from the final showdown with Robotnik.Sonic 3D was the last Sonic title released for the Mega Drive, the only platforming presence of the blue blur in the Sega Saturn, and one of his rare appearances in Personal Computers. The title, considering the era it was released, is somewhat misleading, as instead of full blown 3D graphics it uses an isometric view where Sonic can move not only forwards and backwards, but also left and right.As usual, when Sonic destroys one badnik, an animal leaps free from its insides, but this time Sonic has to pick him up and lead them to an interdimensional ring.To collect all seven Chaos Emeralds, Sonic first must find Tails or Knuckles and offer them at least 50 rings.

http://www.nicovideo.jp/watch/sm42886368