Completion bonus

Successfully complete the game to unlock the New Game Plus mode.

Bonus characters

Successfully complete the indicated task to unlock the corresponding character:

Cream: Get Knuckles on your team, then go to Cream at the center of Green Hill Zone. Find Cheese in the tower to the southeast, and Cream will join your team.

E-123 Omega: Successfully complete the side quest in the northeast of Metropoplis. Ascend to the top, and have Tails fly to the west. E-123 Omega will be in an underground room.