After completing the game, a bonus world will be added to the top of the world map. It is made up not of actual levels, but of what appear to be ideas for special stages or bonus worlds that were cut from the game.
Unlockable How to Unlock Bonus World Finish Lava Mountain Zone 4.
When you collect all of the Red Rings in a zone, you will be rewarded with a Chaos Emerald for that zone. If you collect all seven Chaos Emeralds, you can use Super Sonic in any stage by collecting fifty rings and tapping the icon on the Gamepad.
Unlockable How to Unlock Super Sonic Collect all of the Red Rings.
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