Play as Sonic & Tails Together
At the Character Select screen highlight Sonic and press Up, then highlight Tails and press Down. Highlight Knuckles and press the L Trigger and then highlight Amy and press the R Trigger. Finally highlight Sonic and press A.

Unlock Moon Zone:
When you have beaten the game with all four characters and collected the seven Chaos Emeralds beat the final zone with Sonic. When you have defeated Robotnik, Sonic will go to the Moon Zone as Super Sonic.

Chao Food Points:
The following are the correct amount of points a food item raises or drops

M=Mood
B=Belly
S=Swim
F=Fly
R=Run
P=Power
ST=Stamina

Blue Lump:
0M, 1B, 2S, 5F, -1R, -1P, 3ST

Strawberry:
2M, 2B, 4S, -3F, 3R, 0P, 2ST

Orange:
1M, 2B, 3S, -2F, -2R, 3R, 1ST

Apple:
-1M, 1B, 0S, -1F, 3R, 4P, 2ST

Pear:
2M, 2B, -3S, 4F, -1R, 4P, 2ST

Square:
-3M, 0B, 3S, 1F, 3R, 2P, -1ST

Triangle:
1M, 2B, -2S, 3F, 3R, 0P, 1ST