You have to get all the coins in each race/level, unlock all characters, then, you can use Super Sonic in Grand Prix. I beat the game.
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in sonic r you just collect the sonic tokens and win first place in the stage with song living in the city and with any carecter
you need to get all the 5 tokens in radical city, than challenge tails doll,if you beat him in race, you get tails doll.
You can Download Sonic R for PC from.... http://games2bee.webs.com/apps/blog/?page=2
No it is not. He is only on sonic R.
you beat the game sonic r 100% or you tag super sonic with tails doll or you go to the bathroom turn of all the lights play super sonic racing or can you feel the sunshine backwards and you can see the tails doll in the mirror