Skypiea exploration is a means to get Dials. Players can explore in the Skypiea by spending Beli. When it is done, players will get some Dials, each of the Dials has its own attribute which can increase players’ BP. If players use Dials sound, then they can play easier.
Dials can be upgraded for higher attributes. Players can upgrade Dials by swallowing: higher quality Dials swallow the lower quality Dials or the equivalent quality Dials with lower levels.