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You have to beat him in a boss fight with Sonic.
there are alot of bosses with dr robotnik, and there are a few games called sonic the hedgehog, please specify.
beat the death egg as super sonic and hyper tails
P. u have to go through the levels, beat bosses.
Why yes you can. You have to beat all of the games. And then you go play sonic collection 2 and defeat eggman and shadow will appear. You have to defeat him and he will be unlocked. you can choose sonic or shadow when you choose a game