Thinking of this, Liang Feng turned around and entered a branch road - he felt that it was necessary to clarify this problem first, the so-called 'sharpening the knife does not mistake the woodcutter', as long as he could grasp the law of the direction of travel of this road, it would be better to spend a few days than to rush around and try his luck everywhere now.

Of course, the area of this underground palace is still limited after all, and a deacon who has entered the ninth rank of the Dao can basically reach the palace in the center of the underground palace in a few days.

"If you can figure out the rules of the topography of this dungeon, it is not only the first layer of the dungeon that can be used, but also the four layers of the dungeon below, so it is cost-effective to delay here for a few days. He thought to himself.

After laying out several defensive circles at the entrance of the cave, Liang Feng picked up his four maps and began to compare them in detail—two of these four maps were from sixty years ago, and two were from one hundred and twenty years ago—of course, each map was incomplete, and should only be a small part of the route of the underground palace at that time.

After comparing for a long time, he didn't find any clues, and he secretly said in his heart: "Is it really just luck to see who can reach the palace in the middle faster?"

Whoever can reach the middle palace the fastest will of course have a great advantage - not only can they find the treasures in the palace first, but they can also enter the next floor faster, and of course, they can also set up an ambush at the exit of the next floor to seize the treasure or snipe their enemies.

After pondering for a moment, Liang Feng still felt that this underground palace should not only rely on luck to decide who can reach the palace in the middle the fastest - the so-called 'Heavenly Dao rewards diligence', which means that Heavenly Dao will reward those who are diligent in thinking and diligent in doing, and if this Fallen Demon Island only relies on luck to decide the victory or defeat, it is obviously not in line with Heavenly Dao.

Liang Feng sat on a stone block, holding the paper in one hand and looking at it motionlessly, constantly putting forward hypotheses and rejecting hypotheses in his mind.

After putting forward dozens of hypotheses and rejecting them all, Liang Feng stood up and walked around the cave to think—the shapes of those routes were so deeply imprinted in his mind that he could draw exactly the same routes without looking at the graphics on the paper.

As he paced slowly, all the road maps appeared in front of him - "Some of these roads are from east to west, some are south to north, and some are from north to south, and none of them have similar lines......

"Wait, wait! These roadmaps should be laid out in a proper position!"

Thinking in his heart, he put a palace in the center of the virtual picture he imagined, and then put several road maps in the direction of the north and south-

Looking up at the virtual picture for a long time, Liang Feng suddenly had a flash of inspiration in his mind, and said secretly: "These routes to the center have a characteristic, that is, there are many unconnected Yongdao that gradually approaches the center, and these Yongdao are all arc-shaped Yongdao and are at an angle of forty-five degrees to the radius...... These tunnels are all sections of 'conformal spirals'!"

"Malegobi, it turns out that this road map can only be seen in the polar coordinate system!" he was quite excited.

Rubbing his hands, Liang Feng immediately put away the defensive magic array flag placed at the entrance of the cave, and used his body to enter the branch road and began to search for the Yongdao that matched the characteristics of the 'equiangular spiral' and turned towards the center——

After searching for more than an hour, he did not find any eligible Yongdao.

"It's strange! Could it be that your own inference is wrong?" Standing at the intersection of the two separate roads, Liang Feng was puzzled-

The road he was on now seemed to be a road perpendicular to the radius, and the one that crossed it seemed to go directly in the direction of the central palace, but it wasn't—the road would make a big bend not far ahead, and then come back to this road—of course, the place where it came back was not here.

Unfolding the picture of the route under the polar coordinate system in front of him, Liang Feng looked at it for a while, and couldn't help but shout: "Malegobi, so that's the case!"

He found that his previous inference was not wrong, but it didn't seem to be enough—on the route, after passing a section of the 'conformal spiral' corridor that turned to the center, it seemed that he had to go back a little further through another reversed, shorter 'conformal spiral' corridor to jump back to one of the corridors in the outer circle, and then look for a new 'conformal spiral' corridor in the outer ring corridor that turned to the center—

This is roughly equivalent to taking three steps to the center and taking two steps back before taking another three steps.

Noticing any movement around him, Liang Feng turned around and headed back—now he needed to find the 'conformal spiral' passage to the outer circle.

This time, he quickly found a qualified Yongdao - after walking through the zigzag and twisting Yongdao, Liang Feng secretly said in his heart: "Although there are many twists and turns in this Yongdao in terms of details, but on the whole, these twists and turns are interference, and after removing these interferences, it is a conformal spiral in the strict sense!"

Walking to a fork in the road where two roads intersected, Liang Feng was a little puzzled again: "Should I continue to walk forward, or should I turn on this circular road perpendicular to the radius?"

After thinking about it for a moment, he continued to walk the same path - but this time he only walked for a moment and realized that the path must have been wrong, because the path had become a 'non-equiangular spiral'.

In this way, it took Liang Feng more than half a day to successfully arrive at an extraordinarily thick corridor - looking forward from the corridor, he could see a trench dozens of zhang away in front of him, and behind the trench was a huge stone gate made of huge stones and completely opened, and there was a huge strange and bright red pattern on the lintel of the stone gate.

"This seems to be the entrance to the central palace. Looking at the darkness inside the big stone door of the cave, Liang Feng pondered for a moment, his eyes were fixed, and he rushed towards the stone gate - since he had already arrived here, and he had to go in sooner or later, why not simply order.

Below was a dark and seemingly bottomless trench, Liang Feng stopped beside the trench for a moment, and then used his body to leap out-

A black line shot up from the dark moat, like a giant hand grabbing Liang Feng's feet—

Feeling the cold and sharp energy below, Liang Feng let out a low shout: "Divine thunder!" With another flick of his fingers, a ball of green light greeted the black line-

"Boom!" A cloud of black mist burst out more than a dozen feet below Liang Feng, and the black line seemed to be shorter, and it quickly retracted. There seemed to be a terrible wail from the depths of the moat, "Ahhh

Liang Feng crossed the deep trench that was more than ten zhang wide, stopped a few dozen zhang in front of the gate, and used the 'Sound Transmission Divine Gu' to listen to the movement inside the gate—the gate seemed to be quiet.

There was a voice behind him—

Liang Feng turned his head to see that a thin deacon of the Shenmu Sect was also using his body and was about to leap over the deep trench of more than ten zhang.

Another black line shot out of a deep moat, wrapped around the deacon's feet—

"Break!" the deacon shouted—now Liang Feng finally saw that the deacon was Gongsun Haoran, the great-nephew of Gongsun Liebo, and also the fox friend of Dongfang Qingfeng.

A white light transformed by the 'Kunwu Dragon Slaying Sword' slashed towards the black line—

The black line seemed to be blurred, and it was not broken in two by the 'Kunwu Dragon Slashing Sword', but continued to wrap around Gongsun Haoran's legs - in an instant, Gongsun Haoran's legs were wrapped around and around the black lines.

Gongsun Haoran's body sank suddenly, and he fell into the trench for a distance before stopping again-the wind boat emitted a dazzling red light and wanted to fly up, and the black line collapsed straight and pulled down inch by inch-

On the sinking wind boat, Gongsun Haoran shouted bitterly: "Dandan! Dandan! Save me, ...... Help me!"

"Save you, save you, the brute who wants the young master and me to die? hum...... By the way, just now Gongsun Haoran obviously saw himself standing here first, but he didn't say hello, but wanted to quietly cross the deep trench, his mind was very suspicious!" The thought flashed in his heart, Liang Feng stood still, and watched Gongsun Haoran gradually sink into the deep trench - his mournful cry became more and more poignant, and soon became inaudible.

A black mist rolled at the bottom of the trench and then calmed again.

Liang Feng watched Gongsun Haoran disappear into the black mist, and he was a little lucky in his heart, and said secretly: "Fortunately, young master, I was cautious enough just now - I immediately used the 'True Yuan Divine Thunder' on that ghostly and very weird black line." If you used the 'Kungo Dragon Slaying Sword' at the beginning, then even if you don't die, you will be injured a lot. ”