There are one of two endings you can get when you complete the game. One doesn't give full closure to the game's story but the other does.
Unlockable How to Unlock View the good ending Complete the Crystal Egg Zone (Secret Level)
Contributed By: rr a ven.
Follow the instructions given.
Unlockable How to Unlock Crystal Egg Zone (Secret Level) Get all the Chaos Emeralds, then finish Scrambled Egg Zone
On the title screen, hold Left+Down on the D-Pad as well as the A and B buttons. When you see Tails blink for the third time (he first blinks one time, then two times quickly), press Start on the *third* time while his eye is closed. If done correctly, you will reach the level select screen.
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