To unlock game tracks in the Audio Room under the Extras menu, perform the following tasks:
Successfully complete the Babylon storyline to unlock Eggman.
Complete Storm's, Wave's, and Jet's missions to unlock AiAi, Ulala, and NiGHTS.
To play as Super Sonic you must get all the Gold Emblems in Mission mode. Then, a Chaos Emerald will be selectable as one of Sonic's Extreme Gears. Choose it, and Super Sonic will appear. Super Sonic goes ridiculously fast, and has all three types (Speed, Power, Flight). However, he has some disadvantages. For example, you will lose rings rather than air. This means that sharp turns and boosting/attacking will make you lose rings. Once you have lost all your rings, you will revert back to normal Sonic. To change back, simply acquire one or more rings.
Zack Rychel.
Complete 100 races to unlock E-10000G. Alternately, accumulate over twenty hours of game time.
Accumulate over fifty hours of game time to unlock E-10000R.
supersonicx240.
Win the Babylon Cup with a Gold Emblem to unlock the Sega Illusion track.
Successfully complete the Babylon storyline to unlock Sonic's Blue Star II board, Eggman's Egg-Rider scooter, and the Magic Carpet. Note: When you get the Magic Carpet the description reads "The ancient legendary gear!". However, it also has the ability to make anyone who rides it have the flying skill.
Complete all of Jet's, Wave's and Storm's missions to unlock the Hang-On gear, Opa Opa gear, Super Hang-On gear, and The Crazy gear.
Play Storm's missions to find the following boards and repair manuals. Complete Metal City mission 5 to unlock the Fastest Board. Complete Digital Dimension mission 5 to unlock the Fastest Repair Manual. Get the Legend Board in Babylon Garden mission 5 on a hidden rail behind a tower after the jet. Complete Sand Ruins mission 5 to unlock the Legend Repair Manual. Complete Egg Factory mission 5 to unlock the Powerful Gear Board. The Powerful Gear Repair Manual can be found between two fly rings in Sega Carnival mission 5. The Turbo Star Board can be found between two fly rings in the centipede part of Green Cave mission 5. The Turbo Star Repair Manual can be found on a rail over the river in Splash Canyon mission 5.