Big
Purchase all pictures of Tails in Sonic's room to unlock Big in versus mode.
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Bonus characters
Successfully complete story mode to unlock more playable characters.
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Chao
Purchase all pictures of Knuckles in Sonic's room to unlock Chao in versus mode.
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E-102 Gamma
Purchase the last picture of Amy in Sonic's room to unlock E-102 Gamma in versus mode.
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Get two Force Jewels
When you are in battle, their will be a HP card with a number over the enemy's head. If you get the same number card as the enemy, it will say "Critical". After the battle is over, it will show you two Force Jewels. Note: This does not work with Preioustones Battles.
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Hidden artwork
Place the game disc in a PC compatible CD-ROM drive to find artwork from the game in the "sonic shuffle" folder.
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NiGHTS
Set the Dreamcast system date to December 24 to replace Lumina with NiGHTS. Note: All characters may need to be unlocked first.
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Notebook
Successfully complete the game and enter Sonic's room to find the Notebook on the table.
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Super Sonic
Purchase all pictures of Sonic in Sonic's room to unlock Super Sonic in versus mode.
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