X-Zone (X-ゾーン X-zōn?) is the penultimate Zone in Sonic Advance. It comes after the player finishes Cosmic Angel Zone, and acts as the final zone for Tails, Knuckles, and Amy. It is also Sonic's final level if he enters without acquiring all of the Chaos Emeralds from the other Zones. If they are all collected, Sonic will continue on to The Moon Zone.