The Chosen System: Counterattack with Husband

Xu Yiyu and Lin Yi didn't chat for too long before Rong Yan stood up with the final calculation result in his hand.

The smile on his face was so obvious that Xu Yiyu even had the idea of ​​not confirming the answer with him one last time, and wanted Rong Yan to fill in the answer to the Sudoku directly.

However, this was just a fleeting thought.

"Xiao Yan, are you sure the answer you calculated is correct?"

"Sister Yi Yu, my math score in the college entrance examination was... 148 points."

Hearing Rong Yan's seemingly irrelevant answer, Xu Yiyu knew that he was already 90 percent sure.

"Go ahead, Xiaoyan, it's up to you."

"Don't worry, I've checked it five times, there's nothing wrong with the answer."

Lin Yi and Xu Yiyu saw Rong Yan walk to the Sudoku matrix very confidently. He only took one last look at the initial conditions of the matrix, then lowered his head slightly and selected the corresponding stone from the "chess box" with alternative answers on both sides.

Looking at this scene, Xu·Science Newbie·Yi Yu was indescribably envious.

Wow, she was two points away from full marks in mathematics in the college entrance examination, which is nearly twice her score that year. She is indeed a big shot.

As the captain of the provincial criminal police team, Lin Yi would have been unable to resist poaching Rong Yan if his mind had not reminded him that Rong Yan was a regular member of the Chinese team.

Strong in theory, logic, execution and physical fitness.

Such talents are definitely sought after in any province's criminal police team.

They are indeed the carefully selected talents of the Chinese team, and they can be relied upon at critical moments.

Rong Yan had no idea what the two companions behind him were thinking. He just carefully and quickly placed the stone with the correct number into the corresponding groove of the Sudoku matrix. Before putting it in, he checked it twice against the calculation result in his hand. Only after confirming that it was correct did he push the stone completely into the corresponding groove.

In a blink of an eye, one third of the two hundred empty grids had been filled with stones, and this matrix seemed to have a very advanced automatic recognition function. Whenever Rong Yan pushed a stone into the groove, the stone would automatically stick tightly, leaving no second chance for the test taker.

However, Rong Yan's answering process has been smooth so far, and the Sudoku matrix has not given any warning that the answer is wrong, allowing him to fill in the answer smoothly until the last nine-square grid.

Neither Xu Yiyu nor Lin Yi spoke to distract Rong Yan, but their eyes never left Rong Yan.

Although they knew Rong Yan was very cautious, if something unexpected happened, they would be able to provide timely assistance before the mechanism was triggered.

When filling in the last nine-square grid, Rong Yan took a deep breath, took off the gas mask he had been wearing on his face, and lowered his head to carefully check the calculation paper and the remaining stones in his hand twice.

They were now some distance away from the mine where the three of them had come up, so he wanted to be more cautious with the last few numbers.

Xu Yiyu and Lin Yi stood where they were, neither stopping nor saying anything, but just silently observing Rong Yan's every move.

Although the two appeared calm on the surface, they were actually very nervous deep down.

When many movies are approaching their ending, it is also the moment when they are most likely to miss plot points at key points.

They can't relax, nor do they dare to relax.

When Rong Yan placed the last stone in his hand into the last groove of the Sudoku matrix, Xu Yiyu repeatedly told himself in his heart that he needed to stay calm, but his heartbeat still accelerated uncontrollably.

After Rong Yan completely let go, he fixed his eyes on the completed Sudoku puzzle in front of him and stood there quietly for a while.

Xu Yiyu and Lin Yi also watched the situation of the mechanism without daring to breathe, for fear that they would not react in time if any trap was triggered.

The air was quiet for a few seconds.

Neither good nor bad things happened.

Just when Xu Yiyu began to wonder whether there was some hidden mechanism near the Sudoku matrix that she had not noticed, a very crisp "click" sound came to her ears.

After the sound, the 15 times 15 Sudoku matrix started moving in front of the three people.

"Can I give a bad review? The recognition speed of this mechanism is not sensitive, and there is even a delay."

In order to avoid the atmosphere being too serious, Xu Yiyu made a joke.

Although it was a joke, she was also aware that someone in the dark might hear it.

Who asked him to set up this mechanism when designing the underground palace? Can't he accept the most realistic feedback from users?

The matrix first rotated 90 degrees very slowly in a clockwise direction, paused at this angle for a few seconds, and then rotated 270 degrees counterclockwise at the same speed.

Since the Sudoku matrix was made of stone, it made a friction sound against the wall from time to time when it was rotated, which made Xu Yiyu, who was standing aside, feel a pang of pain in his teeth.

There used to be three sounds in this world that Xu couldn't stand, but now there are four.

After the Sudoku rotated 270 degrees counterclockwise, it seemed to have completed all its missions. It suddenly collapsed into the wall and embedded itself deeper into the wall.

The wall, which originally seemed to have no cracks to the naked eye, seemed to have a switch pressed after the solved puzzle was embedded in it. In an instant, a crack like a rift appeared in the middle of the wall.

Then, the Sudoku puzzle that Rong Yan had just spent a lot of effort to solve was perfectly split in half from the middle, and slowly retreated along the ground to the left and right side walls, revealing an entrance for two people to pass through.

To the three's surprise, the inside of the door was not completely dark. Instead, it was illuminated by the firelight, with every detail clearly visible.

But the thing that appeared in the center of the room was really beyond Xu Yiyu's expectations.

——A clepsydra made up of several bronze clepsydras was placed in the center of the room. Water was dripping from the spouts of the clepsydras at a very slow speed, as if it had stayed in this place for a very long time.

Xu Yiyu subconsciously looked up at the clepsydra that was placed at the highest point, only to find that there was a very small round hole on the ceiling of the roof. There were traces of moisture around the hole due to long-term infiltration in water. It was most likely the water injection hole for replenishing water in the clepsydra.

Rong Yan, who was closest to the clepsydra, leaned over to take a look at the clepsydra, which was relatively low, and found that there was nearly half of the water left in it, but the water inlet at the top of the room did not continue to pour water into the clepsydra.

The bell was located in the middle of the room, and on the left and right sides of the room, about two or three meters away from the bell, there suddenly appeared two wooden doors with very simple styles and patterns. Both doors were closed.

Rong Yan tilted his head to look at the back which was blocked by the night watch. He discovered something and suddenly smiled. He turned around and greeted Xu Yiyu and Lin Yi.

"Sister Yi Yu, Captain Lin, I think you need to come and see this."

When Xu Yiyu stepped into the room first, Lin Yi followed.

As soon as she saw the scene behind the night watch, she knew why Rong Yan wanted to keep this in suspense.

A tightly closed tall stone door came into view. On the two door leaves of the stone door were two round door knockers that had been polished to a very round shape. The style was at least 90% similar to the gates of ancient Chinese mansions.

Not only that, there are four large characters engraved in small seal script on the edge of the clepsydra at the highest point of the Genglou, which are obviously hints.

——When the water runs out, the door opens.