Exploration is unlocked when candidate reaches level 9. Send out your Childs on explorations to earn EXPs and items. There are 5 exploration areas. The first area will be unlocked at Candidate level 9, and other 4 areas will gradually be unlocked when you reach level 12, 18, 22, 30. Each exploration area you must send 5 Child out for 1 hour, 3 hours, 6 hours and 12 hours of exploration durations. The longer the exploration the more EXPs earned to the Childs, and the higher the rarity of items obtained.