Collect all of the red rings in a zone and you will unlock an extra level in that zone.
Clear the game once to unlock harder versions of the main levels.
Beat the final boss.
| Level | How to unlock
|
|---|
- Desert Ruins Zone Extra Level
| - Collect all 15 red star rings in Desert Ruins.
|
- Frozen Factory Zone Extra Level
| - Collect all 15 red star rings in Frozen Factory.
|
- Lava Mountain Zone Extra Level
| - Collect all 120 red star rings in the game.
|
- Silent Forest Zone Extra Level
| - Collect all 15 red star rings in Silent Forest.
|
- Sky Road Zone Extra Level
| - Collect all 15 red star rings in Sky Road.
|
- Tropical Coast Zone Extra Level
| - Collect all 15 red star rings in Tropical Zone.
|
- Windy Hill Zone Extra Level
| - Collect all 15 red star rings in Windy Hill.
|
Clear all of the special stages to collect the Chaos Emeralds and you'll gain access to Super Sonic.
