Sonic Shuffle Codes -

Hidden artwork:
Place the game disc in a PC compatible CD-ROM drive to find artwork from the game in the "sonic shuffle" folder.

Bonus characters:
Successfully complete story mode to unlock more playable characters.

E-102 Gamma:
Purchase the last picture of Amy in Sonic's room to unlock E-102 Gamma in versus mode.

Chao:
Purchase all pictures of Knuckles in Sonic's room to unlock Chao in versus mode.

Super Sonic:
Purchase all pictures of Sonic in Sonic's room to unlock Super Sonic in versus mode.

Big:
Purchase all pictures of Tails in Sonic's room to unlock Big in versus mode.

NiGHTS:
Set the Dreamcast system date to December 24 to replace Lumina with NiGHTS. Note: All characters may need to be unlocked first.

Notebook:
Successfully complete the game and enter Sonic's room to find the Notebook on the table.

Hint: 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.