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Very fast Sonic
In Multiplayer mode in any level or match, equip the Red Gem on Sonic, activate it and keep pushed it, then die. While still keep pusheding 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.
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Free mode characters
Successfully complete the indicated task to unlock the corresponding character in Free mode:
| Blaze the Cat | Successfully complete all Soleana mystery missions. |
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| Amy Rose | Successfully complete all Soleana mystery 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. |
| E-123 Omega | Successfully complete all GUN Commander missions with an 'S' rank. |
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| Rouge the Bat | Successfully complete all GUN Commander missions. |
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Overcomeing Solaris
First, use Silver to weaken him until his first arm guard falls off. Then, switch to Shadow and hit him with the beams until his second arm guard falls off. Next, use Sonic to defeat the rest of his first form. Finally, use all three to survive the blows of lasers, and continuously attack.
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Overcomeing big enemies faster
When facing an enemy that requires more than one hit, use your Homing Attack on it then use your Bounce Attack.
Notice: You must first have the Bounce Bracelet.
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Completion bonuses
Get a 100% completion for Sonic, Shadow, or Silver's episode to unlock the Audio and Theater room under the Extras menu.
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Play as Silver The Hedgehog
Successfully complete the Silver The Hedgehog Boss battle with Sonic to unlock Silver's episode.
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Audio Room music
Successfully complete the indicated episode with a 100% rank to unlock the corresponding theme in the Audio Room:
| Elise's Theme | The Last Episode |
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| Shadow's Theme (All Hail Shadow) | Shadow's Episode |
| Silver's Theme (Dreams of An Absolution) | Silver's Episode |
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| Sonic's Theme (His World) | Sonic's Episode |
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Play as Shadow The Hedgehog
Successfully complete Crisis City with Sonic to unlock Shadow's episode.
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Last episode
Successfully complete Sonic, Shadow, and Silver's episode to unlock the Last episode.
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Overcomeing Silver
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.
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Free mode
Get an 'S' rank on all of Sonic, Shadow, and Silver's levels, Bosses, and town missions to unlock Free mode.
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Longer jumps with Silver
Jump with Silver by pressing X, then push X again while in mid-air. This makes Silver float around. When floating in mid-air, tap X while moving in any direction instead of keep pusheding the button down to make Silver jump further.
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