http://s45.yousendit.com/d.aspx?id=0C2Q ... WPHD6CHEEO
And also, here's the level select screen:

Sonic Team's pulled a Star Fox 64. Twenty-two stages total, but you only go through six per playthrough. Which path you take depends on you decide to side with(Either Sonic and the gang, Eggman, G.U.N., or the Black Doom gang of demon aliens from Hell. There's also the Netrual path where you don't side with anyone at all). For example, in Glyphic Canyon, you can choose to side with either Black Doom or with Sonic's team. To side with Doom, you have to locate five of these jewel beacon things and activate them. To side with Sonic's team, you have to help either Sonic or someone else(In this case Knuckles) kill a certain number of Doom's aliens. To take the Netural path, you just clear the stage without completing either task.
Also, there's multiple ending, two(Good and Bad) for each side. However, I hear that the true ending is the Netrual path's good ending. The rest are just fanservice(Which may mean Sonic could actually die if you're on Doom or Eggman's side).