Come to the golden switch on the lower right. After stepping on it, the three stone platforms on the left will rise for a period of time. So after stepping on it, quickly jump off the high platform and hit the fan-shaped mechanism just now again. Then quickly run to the place shown in the picture and use your rain boots to jump over.

If successful, the player can reach the place shown in the picture and continue moving forward.

Dodge a large robot, go all the way to the place shown in the picture, shoot the target with a bow and arrow, and a treasure box will drop from the sky with a key inside.

Take this key and go back along the original path, go back to the place where the key was needed to open the door, and open the door.

After evading a large robot, open the treasure chest to get the Shield of Choronos.

After getting the shield, return to the previous fork again, this time going to the maintenance department to get the master key. When you come to the maintenance department, you will find a machine that shoots lasers in the middle. It is surrounded by a bunch of boxes. Use bombs to blow them open.

Equip the shield you just obtained. It can refract light. Use this feature to ignite the two devices on the left and right, and open the two doors on the left and right.

Go left first, find something to hold down the mechanism (the oil lamp next to the bookcase will also work), then go back the way you came, and go to the right where the light just refracted.