Yes you can. You have to complete the Babylon Rogues story
maybe not the story but as someone you can play as
You probably can't download it on the computer.You can play it as a wii,xbox,gamecube,and others.
if the bosx say more then one player then you can. some games can play up to four players
Although two different racers can both use the same gear, they can' use the same character. That does not only apply to Sonic.
You can't play as Silver in Sonic Adventure or Dx, Silver wasn't thought of until Sonic the Hedgehog 2006, Play Sonic the Hedgehog 2006 to play as Silver.
Theres nothing really good online, but there are games for wii and stuff with shadow and the whole gang, even silver! some examples are sonic riders, sonic riders zero gravity, (those are fun ones) and sonic adventures 1 and 2. theres also those olympic games with sonic and shadow in them. sonic rivals is also pretty sweet.
No YOU CAN'T PLAY SONIC FREE RIDERS WITH A CONTROLLER,IT'S FOR THE KINECT
Sonic riders
you play all misson thingyobobs
You Have To Play Sonic's Story And As You Progress You Unlock Silver's Story Were You Can Play As Silver And/Or Blaze.
Nothing has been really said yet, SEGA also only made that game for a special 15th anniversery so its most likely not going to have a game sequel. But Silver is going to be in Mario and sonic at the winter Olympics so you can play him in that, along with sonic riders.
Super Sonic is currently evil this has been like this since sonic the hedgehog 3 however whenever sonic is super sonic it seems SEGA doesn't want to implement his dark side so they keep him good all though whenever he talks notice how serious sonic gets this is the only hint to his dark side. The only times super sonic's true dark side has been revealed was in sonic riders and sonic riders zero gravity and most likely sonic free riders, whenever you play with him hear him talk and do other things it is clear he is very evil!