Sonic Shuffle

In-game reset:
Press A + B + X + Y +Start during game play.
Information in this section was contributed by V2.

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.

Rella:
Set the Dreamcast system date to April 1 to replace Lumina with Rella. Note: All characters may need to be unlocked first.

Notebook computer:
Successfully complete the game and enter Sonic's room to find the notebook computer on the table. It allows you to change some configurations.
Information in this section was contributed by angelemily286.

Dolls:
Win in the game in versus mode. You will get a different doll for each character you play. Play Emerald Coast with the game set on two Precioustone for the fastest way of doing this.
Information in this section was contributed by angelemily286.

Toy Box:
Go to the photo album and select ''Another''. Buy the first picture and Lumina will confirm. You will now have a toy box in Sonic Room. With this you can play the mini-games already played in story and versus modes using any character, including a secret one which was not unlocked yet.
Information in this section was contributed by angelemily286.

Hint: Reshuffle:
When the last card of a deck has been used and it is your turn, look at your hand. If you do not like the cards there (for example, you get an Eggman Card), press A + B + X + Y +Start to reset the game. When you start again, you will have new cards. Note: This only works when you are the first person to pick from the newly shuffled deck.
Information in this section was contributed by V2.

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.
Information in this section was contributed by Robert Primerano.

Hint: Sonicooking:
When you land on the Sonicooking mini-game, have the player that is controlling the frying pan hold A and repeatedly turn the knob to the right, or repeatedly press Right. About six or seven fireballs will appear at the top-left corner. The entire screen will say fire, and the three players in the frying pan will lose all their rings. Note: This can only be done once.