Tails is not unlockable. Sonic is the only playable character in Sonic Colors.
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You don't unlock him! If you unlock Sonic and play as him, Super Sonic is his final smash.
in sonic adventure dx you can only unlock metal sonic by collecting 130 sonic emblems.
The code to unlock shadow on ultimate flash Sonic is 595313131313131.
Play as sonic shaow and knuckles
dick hes already in the game