According to IGNpocket, Sega has announced that it will incorporate GameCube connectivity into for Sonic Advance. The GameCube game will have a hidden minigame, the Chao Races. But in order to take advantage of this feature on the system, you must raise Chao creatures on the Game Boy Advance. They can be transferred to the GameCube through the use of the Game Boy Advance/GameCube communication cable.