The secret room after the removal of these two hard walls is shown in Figure 2. The remaining two walls can be easily removed, so this figure 3 can be completely ignored.

After all the four walls are removed, only four columns and a pair of foundations are left, as shown in Figure 4. The removed door locks and walls are placed in the original direction, which can be used for reference, and this picture can also be ignored.

By now, everyone should have destroyed the whole chamber of secrets. It's time to work constructively. Before building a house, we must first understand the materials used-slats. As shown in Figure 5, these twelve wooden strips actually have only three shapes (circled with a blue border, do you think it is much easier at once), and each wooden strip has three grooves. Finally, when the house is completed, all these grooves will bite with the grooves of other slats. ?

For us to build a secret room, these twelve sticks can be divided into three categories (as shown in the red box in Figure 5). The leftmost pair of symmetrical battens is used as a cross door lock, and half of the middle two pairs of symmetrical battens are used as columns, which just bite the door lock. Therefore, when installing, pay attention to the same direction of the groove, and the remaining half is used to engage with the foundation. Please refer to the previous figure for the specific installation method, and do not repeat it. As for the remaining six, it is the foundation and wall. This part of the work has no technical content at all If necessary, please refer to the above picture, because the whole process is reversible, so how to disassemble it.

You can put something in before you finally close the door of the secret room, so if anyone wants to take it out, it will take some brains. Of course, you can also put a six-piece kongming lock in it.