The Moon Zone is the final zone of Sonic Advance. It can be accessed if the player has collected all of the Chaos Emeralds and finished the game with all the characters. It takes place at the end of Sonic's story after completing the X-Zone.
Following the X-Zone, Sonic transforms into Super Sonic and fights Eggman on the surface of the moon. This boss is somewhat effortless, jump and dash when his head is exposed. Sometimes, Eggman will fire a pod: if it catches Sonic, he'll stay inside the pod until he manages to break free. If charged at, the pod will release rings. Eggman will also fire a laser which doesn't really do anything, but it will knock Super Sonic back a little. At times, the arms will vibrate, which will cause some fragments to fly into the air.
After defeating the mech, Sonic will disappear for a few days. Then, while Tails is flying the Tornado, he spots a streaking yellow light, which turns out to be Sonic (still in his Super State). He'll give a smile and the credits will play.
The boss of this level is Super EggRobo.