The idea was cooler in my head! :[
I tried to keep the lines and shading simple, especially after the painstaking work I had to do for the last deviation... just thinking about that makes me dizzy! I'm trying to stay away from fancy coloring for a while, not that I was ever good at it. ;3
Photoshopped as always, except for the lineart, which was done with pencil to save time.

Sonic's expressions, as well as those of his furry friends, have always been so difficult to draw. It's because of his unusual facial anatomy I guess (that single-eyeballed, fat-headed hedgehog!)
Other than "Hyper Sonic", I think I got all of his transformations, the four of which are in the last row. And I'm sorry for butchering up Excalibur Sonic's design. I'm sure it's way inaccurate, but since when have I not messed up in my drawings?!

ENJOY!!

My personal favorite box is Werehog's. That awesome freak of nature!! :]

EDIT: Since I knew at least one person would whine, let me correct myself: I think I got all the transformations appearing in the video games, other than Hyper Sonic. There!

2nd EDIT: And since people are STILL whining, let me clarify. Alternate OUTFITS are not TRANSFORMATIONS. That includes Sonic's SA2 secret outfit, Sonic Riders outfit, etc. Gimme a break and just ENJOY the picture, dang!

Quit yo whining!