The Chosen System: Counterattack with Husband

As the three of them walked towards the end of the spiral staircase together, the black cat squatted back on Xu Yiyu's shoulder.

It was not known whether it was Lin Yi's illusion, but Team Leader Xu, who was walking in front of him and Rong Yan, seemed to be holding back a rage, as if she was angry with herself, or as if she was secretly criticizing the bad taste of the owner of the underground palace.

As the stone steps were very high, the two of them could not climb the stairs very quickly. Xu Yiyu did not urge them, but just led the way in front of them without saying a word.

Although it was not stated explicitly, Lin Yi, like Xu Yiyu, sensed the underground palace owner's bad taste.

Knee-high steps, eight doors controlled by mechanisms, and door-opening mechanisms with wildly imaginative design...

If the owner of this mysterious underground palace is really an ancient person, then he must be an ancient person with unique thoughts.

About ten minutes later, Rong Yan and Lin Yi finally climbed to the last step of the spiral staircase.

To be honest, even though the height of the steps is set so high, after climbing up, I didn't feel that the altitude had increased that much.

Although it was a bit difficult to lift my feet every time in the later stage, it actually felt like I had only climbed a height of no more than a dozen floors.

The two of them stopped panting on the last few steps, and finally saw the "door" with the Sudoku mechanism in Xu Yiyu's photo.

Strictly speaking, the real thing doesn't look like a door.

——This is just a stone wall that seems to have no cracks at all, but there is a Sudoku matrix that looks like a Go board carved on the stone wall.

Not only that, the designer of the mechanism seemed to have guessed that someone would come here later, and even placed two open stone boxes that looked like large chess boxes next to the Sudoku matrix. Inside were many stone chess pieces with the numbers 1 to 15 engraved on one side in capital Chinese.

Like the stones in the circular maze, these chess pieces are almost perfectly round.

There were only a few numbers stored on the Sudoku puzzle machine. Lin Yi took a quick look and felt that the known information was pitifully little.

The designer of the mechanism did not provide any hints for passing the level this time. There is not even a single word next to this large 15 times 15 Sudoku puzzle.

Now Lin Yi finally understood why Xu Yiyu had that expression when he saw this Sudoku puzzle.

Chairman Xu did say that she was keen on solving puzzles, but she never said that solving math problems was included in the scope of solving puzzles.

Xu Yiyu leaned against the empty wall next to the Sudoku puzzle with a bit of melancholy. He raised his hand and touched the head of the black cat on his shoulder hard, and sighed unconsciously.

Who would have thought that she would be forced to solve math problems even though she had been out of school for so long!

It’s still a large Sudoku with unclear logic and very few known numbers!

If Xu were faced with this Sudoku puzzle alone, she would have probably collapsed and solved it by force.

For someone who doesn't have a talent for mathematics, this mechanism is really unfriendly...

Different from Xu Yiyu's gloomy expression, Rong Yan started to solve the Sudoku puzzle as soon as he saw the real Sudoku puzzle. He also took out the pen and notebook he used for drafting.

Xu·expression management failed·Yi Yu looked at Rong Yan, who was now emitting the charm of a top student, with eyes full of expectation, and placed all his hopes of passing the level on him.

Lin Yi?

nonexistent!

The helpless expression on his face was even more obvious than that on Xu's face. Rong Yan was the only one among the three of them who had a chance of solving the mystery.

The only one, Rong Yan, had been concentrating on his draft paper. He kept looking up to check the few remaining numbers in the Sudoku matrix, muttering to himself.

"The sum of the numbers horizontally and vertically is the same... There can't be repeated numbers in a nine-square grid..."

"1 to 15 are all there, so there are many possible scenarios..."

"No, filling in the numbers this way will be repeated. It seems that my thinking was wrong just now..."

Xu Yiyu, who had excellent hearing, listened silently to Rong Yan's mumbling, watched him calculating and talking to himself, and finally managed to suppress the melancholy in his eyes.

Yes, at this pace, please keep working hard.

She, Xu, really doesn't want to feel the charm of mathematics while exploring, and she can leave this blessing to Rong Yan.

Time passed by minute by minute. Although Xu Yiyu had no idea how to solve the Sudoku, he could roughly see the difficulty of this puzzle.

She didn't intend to urge Rong Yan to speed up his problem solving process.

On the ground was the draft paper that Rong Yan used for calculations. He had almost filled up the fourth sheet of paper, and he was not lazy at all.

Moreover, Xu Yiyu could also see that Rong Yan was actually making rapid progress on this puzzle.

The fact that the master of the maze is not a human being is none of Rong Yan’s business.

His calculation process was almost written out quickly. Although she, Xu, could only understand a limited part of it, it did not stop her from admiring Rong Yan's concentration.

She was really glad that she brought several talents who were good at theory with her to Yidali this time, otherwise, if she, Xu, relied on herself alone, she would be at a loss.

At least twenty minutes passed as Rong Yan's expression gradually changed from doubt to determination, and then to obvious determination to win.

During this time, in addition to waiting for Rong Yan to solve the problem, Xu Yiyu also found time to chat with Lin Yi.

"Captain Lin, in the cases you have handled before, have there been any suspects whose anti-detection ideas were different from those of ordinary people?"

Lin Yi glanced at Xu Yiyu, and before she could say anything, she added another sentence with a strong desire to survive.

"I have no intention of prying into the confidentiality of the case. If the answer involves something that cannot be said, Captain Lin does not have to force himself to answer."

"It's okay, this is not a secret, Mr. Xu, don't be nervous."

Lin Yi thought for a while, and after searching his memory bank for suspects who met the criteria, he responded.

Since he joined the police force, he has encountered a few difficult people with extremely high IQ and strong logic.

"I've encountered this before. Those cases should have attracted a lot of attention in Anhui Province. If Mr. Xu occasionally pays attention to the news, he should have heard related reports."

Lin Yi selected several examples in his mind and spoke after careful consideration.

"Two years ago, there was a murder case in which the murderer disguised himself as an acquaintance and killed seven people in a month. All of them happened in the area under the jurisdiction of Lucheng."

"Ah, I've heard of this case. It's said that the murderer is a top science student who graduated from a 985 university. He also arranged the crime scene so perfectly that there are almost no valuable clues to be found, right?"

"Well, in order to arrest him, the battle line was stretched very long. Later, we had to invite a traceology teacher who was one of the five tigers of the police force to come out and successfully move forward with the case."

Lin Yi's gaze briefly swept over Rong Yan who was sitting on the ground, and then turned back after a few seconds.

This case was extremely difficult and he encountered more than one obstacle during the investigation. In the end, he almost had to take off his uniform.

"I remember that at that time, almost everyone in the nearby county town was in danger, fearing that they would become the murderer's next target."

Xu Yiyu recalled the case that Lin Yi mentioned, and even now he still felt a chill down his spine.

That man dismembered each of his victims into twelve pieces while they were still alive.

She couldn't imagine how strong a mental state this required, nor could she imagine how much pain the victim must have endured while being dismembered alive.

Fortunately, the murderer finally failed to escape the vast net of justice.