Very good work, just a few things I should point out.
When Sonic runs fast, his frame stops so it looks like he's skating with those shoes that have those wheels on the bottom of them. I think you might already know this, but when you choose this Sonic in Single Player, he does not appear when you play. You have all the sound effects, except for the music (I don't know if you did this intentionally or what, but I don't hear any music. I just hear the sound effects.) Also, on this Sonic's profile, you said he was the fastest, but there can't be two fastests, because the original Sonic also has on his profile that he's the fastest of the group. Other then that and the wierd pink dots that show up, it looks cool. I'd like to say "Great job" to all of you who have worked on this Sonic. I know you've put a lot of effort into making this a success, and I can't wait until the day I can use the final version of this Sonic to battle other people with. Keep up the good work, my expectations are high, but they should be accomplishable. :D