I am up to, and have completed, Radical highway. I have at least a D on all courses, with many being completed with an S or A rank. I don't know where I can go from here. I cannot advance any further.

  • 3
    Have you completed the levels as both New and Old sonic?
    – Robotnik
    Commented Feb 12, 2013 at 4:01
  • 2
    Yes, my first sentence is a tad ambiguous, but I was trying to imply that I have beaten every level up to and including Radical Highway.
    – aperson
    Commented Mar 15, 2013 at 1:06
  • 2
    Wow... This question has been unanswered for almost a year now... Commented Nov 18, 2013 at 0:24
  • 1
    Have you completed the missions to receive the boss key?
    – Kevin
    Commented Jan 16, 2014 at 6:07

1 Answer 1


Complete the "Challenge" Missions to obtain the boss keys, then defeat the next boss. I'm not familiar with the level progression in the 3DS version, as I have cleared the entire xBox 360 version (S Rank on all but Time Eater), but the mechanics should be the same. If the next boss fight is the final boss, you are required to have all the chaos emeralds before you can advance, in which case, you will need to explore the over world to find the rival challenges, defeat them for the emeralds, and then place them in the 'gears' to advance.

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