Okay, fine... I tried to make it not too easy, but also possible to guess what was intended,
but it seems it turned out to be too difficult.
Having lost the last drops of his patience, Dillion Dendark rushed to insert the stones into the holes according to Castor L. Celena's theories. After several unsuccessful attempts and subsequent battles, easily won thanks to the effectiveness of Aiyano Yamagami's external barrier and the combat skills of the group's warriors, the left, right, and central doors finally opened.
You could go completely crazy. Well, okay...