|Beat the hidden stage in Tournament mode|
For this achievement you need to go to tournaments on the main menu, and then you should select singles. You then need to make your way through the tiers, making sure to get at least a AA score on each match. After doing that, you will be granted access to the hidden stage, which is against Dr.Eggman that you must win. If you're finding it hard to beat him, remember you can hit , then select retry to restart the match until you win.
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