I have beaten the game with Team Sonic and Team Rose. When I select challenge mode, there is still one question mark after the final boss. How do I unlock it?
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I don't know but I do know you have to beat the game.All stories.
Beat all teams.Then get all 7 caos emeralds.Then push > when your on team chaotix.
The button label "????" is actually the "Super Hard" mode, which you obviously have not unlocked. Unlock it, you not only have to beat the game with all teams, earn 120 emblems, and defeat the last story, but you also have to finish the extra missions and most importantly, get an A ranking on each and every mission AND boss battles, including the last boss, which can be a real toughy! Good luck, you'll need it. (well luck, or skill, whichever comes first.) Also, there are exactly 141 A rankings possible, in case you were wondering about that.
Beat the game with every character and collect every chaos emerald.
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