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Get a 100% completion for Sonic, Shadow, or Silver's story to unlock the Audio and Theater room under the Extras menu.

When you fight Silver with Sonic, first do a slide move into him as he is falling from the sky. Then, collect a ring and run around until you hear "How bout this?", then do a homing attack on him. Run away again until you hear "How bout this?" again. then do a homing attack again. Repeat this until he is defeated.

Get an "S" rank on all of Sonic, Shadow, and Silver's levels, Bosses, and town missions to unlock Free mode.

Successfully complete the indicated task to unlock the corresponding character in Free mode:

Amy Rose: Successfully complete all Soleana mystery missions with an "S" rank.
Blaze the Cat: Successfully complete all Soleana mystery missions.
E-123 Omega: Successfully complete all GUN Commander missions with an "S" rank.
Knuckles the Echidna: Successfully complete all Town Stage missions with an "S" rank.
Miles "Tails" Prower: Successfully complete all Town Stage missions.
Rouge the Bat: Successfully complete all GUN Commander missions.

Successfully complete Sonic, Shadow, and Silver's episode to unlock the Last episode.

Successfully complete Crisis City with Sonic to unlock Shadow's story.

Successfully complete the Silver The Hedgehog Boss battle with Sonic to unlock Silver's story.

In Multiplayer mode in any level or match, equip the Red Gem on Sonic, activate it and hold it, then die. While still holding the activation button, wait until you respawn. When you respawn, deactivate the gem. You will now run much faster than normal and the time will automatically be slow.