Observation skills of children's hidden characteristics
(PS: This method is undoubtedly an official loophole in the game, and subsequent repairs may not be low)
1, the first step, we need a few dolls with characteristics, and we can find that the characteristics are invisible.
2, the second step, let the baby with characteristics enter the training ground for key training, and the hidden attribute characteristics appear!
3, the castle requires level 7 or above, because the training ground is only open at level 7.