1. The stone column in the center of the first secret room has three wooden columns that can be rotated. Using a viewing mirror, you can see that there are prompt phrases on the wall of the stone column. Several different items are placed in each column, as long as you find the items that match the prompts. Open to get a box, get the device that matches the sight glass, and then you can directly enter the interior of the object.
2. The mechanism can be opened by turning the lock plate so that the notches of the four lock cylinders are in the proper position.
3. Open the door, enter the deeper stele secret room, and put the triangular totem you got on the train on the black slate, you can get a red and green badge.
4. Coming to a door with many badges, you need to unlock the mechanism here, and let the two swords below cross each other.