Get all gold medals in Storm's, Wave's, and Jet's missions and you will unlock the Chaos Emerald board. You can select Sonic and the Chaos Emerald board and you can be Super Sonic.
To get Aiai, Ulala, and Nights, you must complete all of Storm's, Wave's, and Jet's missions. You don't have to get gold, just complete them all.
Play the game for 50 hours.
Unverified. Finish first on Night Chase, Red Canyon, Ice Factory, White Cave, Dark Desert and Sky Road to unlock Babylon Story Digital Dimension. Clear Babylon to unlock the Guardian.
To unlock the two SEGA courses in the game -- Carnival and Illusion -- you must get gold emblems on the grand prix.
