What is the strategy of memory reconstruction?

Memory reconstruction begins with unlocking, and the password is Nancy. After unlocking, open the first box. There are four symbols on the first box. These four symbols all have corresponding numbers. They are in the mineral water bottle. This password will change. The password of the next four symbols is 5333.

After finding the password, enter the password on the box and you can open the first box. After opening the first box, it will float and see some metal. Adjust the metal to the shape shown below. After adjusting the shape, you will see four symbols on the wall. Then click dive.

After diving, you will see some symbols on the underwater wall. Then click on the four symbols according to the four symbols you just saw. After being correct, the second box was opened. After opening the second box, the water level continued to rise. Then you will see a chessboard.

Place the wooden blocks under the chessboard in the shape shown below. After spelling, point out the shape you just spelled on a stone chessboard. After ordering, the third box was opened. Next, you will see a red button. Click to close it.

Click the circle after closing. After clicking, you will see five props around the circle. The iron block represents 3, which is obtained according to the order of the first four iron blocks.