Well online, You can play as Cream on Sonic flash.
sonic2online.com
Nope.
not yet but you can battle mecha sonic in sonic rpg episode 6
At http://sonic2online.com
At playsega.com you can play sonic the hedgehog 1 from the sega genesis just in your internet browser. You only have to be gold member what isn't very expensive. You can also download an sega genesis emulator with the sonic the hedgehog ROM to just play it on your computer.
Sonic Advance 3 (and the Game Boy Advance as a whole) does not have any online capabilities.
You can try going on SEGA.com and click on play sega, make an account, and you'll be able to play any old time sonic game online. There are also at least a few Sonic flash games. You can try a google search for "sonic flash game" or something similar, or try to find one on game sites like newgrounds.com or such.
you gotta download it.
probably super sonic.who ever you play as...well...it does not matter.just for me it is super sonic.
You can get them at gameworks, Toys R Us , sometimes at flee markets, and online.
yes and it is quite fun to play with them they have several