Log 15 hours of game time. (Unverified)

Darkness Gear ... Clear the Hero Story mode.
Tempatation Gear ... Clear the Hero Story mode.
Smile Gear ... Clear the Hero Story mode.
E-Rider Gear ... Clear the Babylon Story mode.
Magic Carpet Gear ... Clear the Babylon Story mode.

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.

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.

• Cream The Rabbit: Finish the Hero Story
• Dr. Eggman: Finish the Babylon Story
• Rouge The Bat: Finish the Hero Story
• Shadow The Hedgehog: Finish the Hero Story