Shu Muhua didn't speak, but took the notebook from Xie Xinyi's hand, sat on the ground, and drew on the paper with a pen.

I also squatted down and leaned over, watching Shu Muhua write a group of numbers, and suddenly Shu Muhua raised his head and said thoughtfully: "If the number is the coordinate, then this cube has a maximum of 26 layers." ”

I was stunned for a moment after listening to this, and then I looked up and thought for a while, "Well, you're right, because the room codes are all three-digit, and the numbers of each three-digit number are added together, which is the coordinates of this point, and the three numbers are added together, and the maximum is the addition of three nines, three-nine-twenty-seven, so this cube has a maximum of 26 layers, am I right?" I looked at Shu Muhua excitedly and said.

"That's right, I also deduced so, I didn't expect you to have such a deep knowledge of mathematics at such a young age." Shu Muhua said with a smile.

I scratched my head a little embarrassed, in fact, I studied physics, and physics has very high requirements for mathematics, and the knowledge of the modern world is summed up by many genius giants after many years, I just received their knowledge directly from the textbook, but Shu Muhua is completely out of the modern world for more than a thousand years, and he has such an ability to deserve my admiration.

I smiled a little embarrassed and said, "Uncle, I am a modern person, a lot of knowledge is learned from books, unlike you, you are a mathematical genius." ”

Shu Muhua laughed: "It's really rare for young people to be so modest, let's not talk about this, let's take a look at the road map we have walked." ”

After Shu Muhua finished speaking, he marked all the rooms he walked through with a pen, but the more he wrote, the deeper his brows wrinkled, and I had an ominous premonition.

"What's wrong? Is something wrong? I asked, a little worried.

"Come and see, these coordinates we have walked through, if we deduce correctly, but the coordinates are not correct." Shu Muhua asked with a frown.

I looked at the coordinates marked by Shu Muhua, and still couldn't see a reason, Shu Muhua saw that I still didn't understand, so he pointed out one of the coordinates, "Look at this, the room code is 477,804,539, if we infer it, its coordinates should be (18,12,17), and then you look at the next room code 837,716,638, its coordinates should be (18,14,17), these two rooms were originally next to each other, but the coordinates are two points apart, so Our inference would be incorrect. ”

After listening to it, I basically understood Shu Muhua's reasoning, "Maybe the person who designed this cube made a mistake and wrote the number one less place?" I asked, raising an eyebrow.

After hearing this, Shu Muhua hurriedly shook his head, and then said: "Impossible, you continue to look at these coordinates, in this place, the coordinates of these two rooms are next to each other, which is completely in line with our inference." Shu Muhua paused for a moment, then pointed to another place and said, "Look at this place again, although the two rooms are next to each other, the coordinates are three places apart. ”

I calculated the coordinates that Shu Muhua said, and sure enough, it was the same as what he said, so I said with a bitter face: "That means that our coordinate conjecture is wrong, let's hurry up and follow the prime number elimination method, anyway, the room has 26 floors, I estimate that it will take a while to go to the bottom."

After listening to this, Shu Muhua shook his head, and then said: "The conjecture of the coordinates must be correct, but we haven't found the doorway inside, if we continue to walk, I guess we won't be able to get out in this life." ”

I was a little surprised when I heard this, "Uncle, why do you say that?" ”

Shu Muhua didn't say anything, but pointed to the drawing and said: "Look here, this is the topographic map we have walked on, we have walked down 26 floors, but we haven't gone out yet, and there is a downward passage in this room." ”

I took a closer look at the route drawn by Shu Muhua, and suddenly sat down on the ground, "How can this be?" Uncle, are you mistaken? ”

"Impossible, I memorized the rooms in my head at the beginning, but I wrote down the following routes after I walked through, and it was impossible to be wrong." Shu Muhua said firmly.

"Holy shit! It's not like I'm hitting the wall again, is it? The fat man interjected.

"You go along, we're studying science, do you understand? The ghost hits the wall with a yarn. "I said the fat man angrily.

"Rub, do you really say you're tall? Isn't science based on practice? Brother, I have walked more roads than you have crossed the bridge, and according to me, there are either ghosts hitting the wall here, or there are ghosts in this room. The fat man said unconvinced.

"There's a ghost in the room?" I said something to myself, but the fat man's words reminded me, I closed my eyes and pondered for a while, and suddenly a light flashed in my head, and I opened my eyes suddenly, "I know! ”

The fat man was startled by my appearance and muttered, "What are the nerves?" What did you find? ”

I smiled mysteriously and said, "Fat brother, you're right, there are ghosts in this room!" ”

"Holy shit, where?" The fat man shuddered with fright, pouted, and drew his saber, "Where?" ”

I smiled, "Don't get excited, I mean, these rooms are alive." ”

"Alive?" Xie Xin said in surprise, "Oh... I see, these rooms are moving, right? Xie Xinyi said with a smile.

"Smart, do you feel that all the rooms here are going to vibrate slightly?" I said with a smile.

"Well, you're right, I've been shaking in the room since I came in, and I didn't think much of it." The fat man said.

"That explains why sometimes the coordinates of the room don't match, right, uncle?" I asked Shu Muhua next to me with a smile.

"Yes, if you speculate like that, it makes sense, and when we met this little girl and that bad guy, they both came out of the next room, but when we tested it again, that room had a mechanism, and we didn't think much about it at the time, but now that we think about it, it can be explained." Shu Muhua said.

"That's not right, it's impossible for our room to move up, we've all taken the elevator, if we move up and down, how can we not feel it?" The fat man said.

I saw the appearance of the fat man, he smiled, although the fat man's culture is not high, but his thinking is still very active, so he analyzed: "Who said that our room will move?" If our room moves, we'll already notice that something is wrong, and when you enter a room, the surrounding rooms will move so you don't notice. ”

"The problem now is to find out how it moves, and by restoring the coordinates, we can get to the edge of this room and get out of here." Shu Muhua looked at the notebook and said softly.

"Then I'll have to study the data again." I nodded.

Shu Muhua took the pen and wrote and drew in the notebook, and finally he pointed to the hole where we came in and said, "You can test the room we came to with your shoes again." ”

The fat man and I took our shoes to the room, the room number was still an even number without the prime factor, if we deduced the law, this room should be safe, but when I threw the boots in, the whole room sprayed a lot of corrosive liquid, fortunately I pulled the rope back in time, but the shoes were corroded off a piece.

"Damn! The original room has really changed, and it seems that it is impossible to go back the way you came, uncle, the road map you remembered is useless at all. I said with a frown.

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