Eggman has broken the world into seven parts, now the player must find the seven Chaos Emeralds to restore the world.

Sonic Advance 3 is a Sonic game with a twist: the player can play with a friend in co-op mode or one of many multi-player modes like ring race. The game contains features from Sonic Advance and Sonic Advance 2, but with more options like choosing from 2 characters in story mode (a leading and a following character).