In the green underground passage, there are two places where the hexagonal handle can be used to change the passage. The first place is that the initial state gap is below, and you can't get through it. You need to turn the passage and block the bottom to get through. The second place is that the gap is on the right, which does not affect the passage. Maybe you just didn't notice: it takes two times to shake the gap to the left to reveal a secret door, in which the stone statue was pushed out by the mechanism to get the book of destruction 2 on the light-colored floor tile at the door, and the silver coin of the wolf was obtained through investigation.