The numbers on the sides are how many generations you must have noted in order to unlock the location.Unlockable locations are as follows:
Secret Laboratory (ひみつきち) - 1
Amusement Park (ゆうえんち) - 4
Dream Beach (ドリームビーチ) - 10
Wishing Fountain (ゆめみのいず) - 15
Observatory (てんぼうだい) - 20
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