The landlord said the third level. After entering the castle, walk to the left of the protagonist. After entering the first door on the wall, go to the long corridor and walk a few steps to the right. You will see a door on the left. After entering, climb the stairs to the second floor. At this time, you should catch the ghost lamp in the air with the ghost hand and fly to your head. After flying to the head, enter the door and turn left. At this time, you are already on the second floor of the castle. At the end, there is a small door. Go straight ahead and you will reach the waterfall. Walking down the stairs, I saw a statue like a snake outside, which means I'm on the right track. I went in to the end, and then I went in. At this time, I returned to the center of the castle. A few steps to the left, there is a turntable device. I broke this mechanism. A few steps behind me, a door walked in and came to a room. After the fight, I went out the back door of the room and walked to the end, where the library was. Please follow the above process first. Please ask me again if you have any questions.