YOU MUST UNLOCK THE LEGEND ACHIEVEMENT!!! You have to defeat the mayor, which is the end of zone 5, on heroic without ever using any training battles or repeating boss battles in the entire game. very hard. doing this will unlock zones 6 and 7. if you do this on chalenging mode you will only unlock zone 6 and you wont get the achievement. Heroic, mayor, no traing or repeating bosses, LEGEND ACHIEVEMENT! You only need the legend achievement to unlock zone 7
