How does hydra walk the maze in the dark carnival?

Note that at the gate of the park, you can find objects by investigating the luminous place on the right, and then you can get a silhouette of Jim. Then you can get a mouse-shaped hilt by investigating the skull at A, and you can get a divination omen by investigating the automatic divination machine on the left. Dark carnival introduction: divination

17. After entering the square, we will investigate the small iron gate first, and then a story will happen. After that, you can get a mask of 1 by investigating the wooden box on the left, an evil silhouette by investigating the game table at B, and a card on the table on the left. Finally, you can investigate the wall inside and put all the three silhouettes you got before, so that you can play jigsaw puzzles. After finishing the puzzle, we can play the puzzle. Then go back to the square and cut the rattan in front of the iron gate with scissors.