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This time, I will explain the details of 100 doors (78-79).

After entering gate 78, we will see a big cipher on the door. There is a height on the left side of the door, which is the same as where we usually measure our height. There are two mushrooms with different heights, and there are two mushrooms with different heights on the right side. The height of all the mushrooms corresponds to the scale mark on the left door. This is the clue. It doesn't indicate whether we are going from left to right or right to right. So we have to try. The final attempt should be from right to left. So from the first mushroom on the right, the height of the first mushroom corresponds to 8 on the left scale mark, so the first number is 8. The height of the second mushroom corresponds to 6 on the left scale mark, so the second number is 6. The height of the third mushroom corresponds to 4 on the left scale mark, so the third number is 4. The last one is also the height of the fourth mushroom We can see that its height corresponds to the 2 of the left scale line, so the fourth number is 2. At this time, let's take a closer look at the top of the mushroom. These penalties represent the order of the password, so the final password is 8426. After entering the password on the door, we successfully open the door to show the green button, and then we enter the next level.

After entering the 79 level, we will find that this level is very similar to the previous one. We just need to figure out how to press the light switch, and finally make all the lights on the door light up, and the door will be opened. Let's try to find out how to press the switch first: after many times of thinking, it was wrong, and finally I found that I made a mistake. At the beginning, I thought it was similar to the previous level, but I didn't know that there was a hidden switch, which was located on the top of the switch in the upper right corner. Finally, we click the switch in the upper left corner, and then click the switch in the upper right corner. Finally, we click the hidden switch in the upper right corner to open the door and show the green button. After clicking, we enter the next level.