Secret Hidden World
Clear the game's first 7 worlds to unlock the secret Hidden Worlds, which includes 4 extra acts.
Extra Bonus World
After you finished the game, a bonus world will be contributed to the top of the world map. It is made up not of actual levels, however of exactly what seem concepts for special stages or bonus worlds that were cut from the game.
Unlock Super Sonic
You will be rewarded with a Chaos Emerald for that area when you gather all of the Red Rings in an area. You can utilize Super Sonic in any phase by accumulating 50 rings and tapping the icon on the Gamepad if you gather all 7 Chaos Emeralds.
Go to the Desert Ruins Area 2 area, till you pass the last checkpoint ahead of the area boss. You'll discover a beehive with 3 holes. Select the lower one and you'll get 4 lives. You can eliminate Sonic and return to play from the checkpoint. It's simple to then gather 4 even more lives, then duplicate the procedure as preferred, for getting 3 added lives each time.