Board Thread:Questions and Answers/@comment-28361257-20160429062539/@comment-24659969-20160429120840

You have to unlock Tomb of Golds first which requires user rank of 1600

Literally speaking, any are beyond tombs of golds requires 1600 user rank. Example, your Gamatoto is level 36 but you user rank is only 500. The highest area unlocked would be Dusty Desert (3rd area), but the moment your user rank raised to 1600, you will unlock all area.