The bronze door is two zhang wide and one zhang high, and it is carved with dozens of patterns of rare birds and beasts.

In the lower position of the center of the bronze door, there is a pair of beast-faced paved heads, fierce beasts with angry eyes and toothy rings.

Perhaps due to its age, the entire bronze door is rusty and covered with patina.

One foot below the head of the beast's face is a rectangular bronze square, which is evenly divided into nine squares and arranged in the shape of nine palaces.

Immediately, Ning Xiaotang, Sikong Xuan and Xiaoba came to the bronze gate, and both of them looked at this bronze gate full of historical vicissitudes with curiosity.

"What's that, is it a lock?" Ning Xiaotang noticed the rectangular bronze square at first glance.

Sikong Xuan was also very curious, he stepped forward, and after taking a closer look, he nodded and said, "You are really right, this is really a lock." ”

Xiao Baqi said: "In this world, there is still such a lock, it doesn't look like a lock at all." ”

"This is the Nine Palace Lock. Sikong Xuan explained, but he quickly denied it, "No, this is not the Nine Palace Lock. Oh my God, this should be the legendary long-lost ninety-nine-eighty-one palace lock. ”

Jiugong Suo Ning Xiaotang had seen only a few words in books, but Jiujiu Eighty-one Palace Suo, he had heard of it for the first time.

Ning Xiaotang asked, "Old man Sikong, what is the Nine Nine Eighty-One Day Palace Lock?"

Sikong Xuan said: "This ninety-nine-eighty-one day palace lock, I just heard my master mention it." You see, this bronze square is evenly divided into nine squares, arranged in the direction of nine palaces, at first glance, I thought it was a nine palace lock. But if you look closely, is each of these squares evenly divided into nine squares? In this way, the bronze squares are actually evenly divided into eighty-one squares. ”

"Every little tile can be moved. Once all the eighty-one squares are moved, the complexity is unimaginable. Compared to the nine-palace lock, I don't know how many times more complicated. Arguably, this is the most complex lock in the world!"

Speaking of this, Sikong Xuan frowned slightly, and said, "It's just that I heard my master say that this ninety-nine-eighty-one palace lock has been lost for many years, and now, almost no one knows about its existence." Unexpectedly, in this tomb of King Yue, I was able to see the ninety-ninety-eighty-one palace lock again. ”

Xiao Hachi flapped his wings and said, "I said tomb robber old man, this lock is so complicated, can you still open it? Don't you get to the end, we ran away again in vain?"

Sikong Xuan said: "Don't worry, the family master once passed on the solution of this lock to me, although I have never used it, but I want to give me some time, it should still be able to open." ”

Xiao Badao: "Since that's the case, then you should start quickly." ”

Sikong Xuan nodded, stopped talking nonsense, and immediately began to unlock.

He studied the bronze square, which had been divided into eighty-one squares, and then, with a finger, he gently moved one of the small squares.

At this moment, on both sides of the passage, there was a sudden sound of "click~~" turning the machine.

Immediately afterwards, on the stone walls above both sides of the passage, circular black holes were exposed, and sharp arrows glowing with cold light poked out of the circular black holes, facing the two people and one bird below.

Xiaoba was immediately startled, and hurriedly flapped his wings and flew backwards, complaining in his mouth: "Grass, so many sharp arrows, old man robbing the tomb, are you trying to kill us?"

Sikong Xuan was also startled, but after looking at it twice, he immediately calmed down and said, "It's okay, the reason why these arrows appeared is because I started the unlocking action." As long as I unlock it next and there are no errors, these arrows won't fire. ”

At the moment when the arrow appeared, the two of them were one bird, and only Ning Xiaotang was still as calm as ever.

Because he didn't feel his life threatened, the arrows didn't seem to be a danger to him.

Ning Xiaotang said: "Old man Sikong, you can continue." ”

Sikong Xuan nodded and continued to unlock.

He frowned in thought as he kept moving his fingers around the small squares in the bronze squares.

The arrow really didn't shoot down, which also means that at least so far, Sikong Xuan has not made a mistake.

But even so, Hachi still hid far away, watching from behind.

Little by little, about a quarter of an hour later.

Hachi couldn't help but shout from behind: "Hey, old man robbing the tomb, why are you so slow? Why are you not okay?

Sikong Xuan paused slightly, and replied: "Don't worry, this is the most complicated and difficult to solve the ninety-nine-eighty-one palace lock in the world in history, how can it be so easy to unravel? Give me two more hours, and I will definitely be able to unlock it." ”

"Grass, we have to wait two hours!" Hachi couldn't help but say a little irritably.

Ning Xiaotang also frowned slightly, two hours had indeed been a little longer.

So, he stepped forward and said to Sikong Xuan: "Old man Sikong, let me try." ”

Seeing that Ning Xiaotang wanted to try to unlock it, Sikong Xuan couldn't say anything.

After all, Ning Xiaotang's impression on him has always been unfathomable.

However, Sikong Xuan didn't believe that Ning Xiaotang would unlock the ninety-nine-eighty-one palace lock.

Therefore, after he gave up his position to Ning Xiaotang, he retreated far away, standing with Xiaoba, he didn't want to be shot into a hornet's nest by those arrows.

As for Ning Xiaotang's safety, Sikong Xuan was not worried. In his opinion, with Ning Xiaotang's unfathomable martial arts, it was not a piece of cake to deal with those arrows.

After Ning Xiaotang took over the position, he was not in a hurry.

There was a faint glow in his eyes, and a pattern similar to Tai Chi loomed in his eyes.

At this time, with the help of the Enlightenment Stone, Ning Xiaotang's brain calculation speed was extremely fast, to the point of being incredible.

One by one, unlocking schemes came to his mind, and then quickly disappeared.

However, in a dozen breaths, there were tens of millions of unlocking schemes, which flashed through his mind.

In the end, after layers of screening, I don't know how many unlocking schemes were filtered, and a clear and correct unlocking scheme came to Ning Xiaotang's mind.

On the other side, Sikong Xuan saw that Ning Xiaotang had been thinking about it, but he hadn't unlocked it, and couldn't help muttering: "The ninety-nine-eighty-one palace lock is not so easy to solve. It took two hours to unravel it, and it was already very fast. ”

Xiao Ba was also a little puzzled, and didn't understand why Ning Xiaotang hadn't started unlocking yet.

However, at this moment, Ning Xiaotang suddenly moved, he stretched out a finger and gently moved one of the small squares on the bronze square.

The arrows were still hanging on both sides of the passage, and they were not fired, and Ning Xiaotang had solved this step correctly.

Ning Xiaotang didn't pause, and immediately after, he began to move the second small square, then the third, and then the fourth......

He moved faster and faster, and at last he could only see a shadow of his hand moving rapidly.

Sikong Xuan and Xiao Ba were all stunned to look at Ning Xiaotang's hand shadow, and from time to time they looked at the arrows hanging on both sides of the passage to see if the arrows had been fired.

After about dozens of breaths, there was a sudden "clang~~~", the sound was long, and the aftermath echoed.

With this sound, the closed bronze door revealed a crack in the middle, and the back crack became larger and larger.

The bronze door opened at this moment.

"How long has it been? The bronze door has actually opened, and the lock of the Heavenly Palace has been opened so quickly?"

Sikong Xuan stared at the scene in front of him blankly, a little incredulous, and the whole person was stunned.

"Grass, so fast!" Hachi was also stunned, his eyes widening.