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With his understanding of Brea City, Bai Ye came to the bottom of the Mukefu Mansion with ease.

"The clue to the hidden treasure is becoming more and more obvious, and sure enough, it is above the building."

The tiny fluorescent dot seen at 75 Deyue Street in the North Sea has now turned into a fist-sized cluster of light, hanging above the top of the Mukoff Building.

Bai Ye didn't waste any time and hurriedly entered the building.

The first floor of the building has not changed, and in the lobby there is a sculpture in the shape of a globe, with an octopus tentacle in the lower right corner of the sculpture holding up the emblem of the city, and the character 'MURKOFF' is written next to it.

"The highest building is fifty floors?"

After entering the elevator, he noticed that the maximum value displayed on the virtual LCD screen in the elevator hall was 50, which corresponded to the elevator card that Bill gave him.

"Just take the elevator up to complete this task?"

Thinking so, he put the elevator card on the sensor and swiped it, and the familiar soft female voice appeared:

"Welcome to Mukoff!"

"The floor you're going to is the 50th floor."

The elevator doors slowly close, and the elevator begins to rise at a fast and steady pace.

"The initial process didn't look any different than the previous ones."

About two minutes passed, and the elevator began to slow down.

A few seconds later, with a soft 'ding', the elevator stopped rising, the door slowly slid open, and a soft female voice also introduced: "The 50th floor has arrived, and the 50th floor of the Mukoff Building is the 'Mutant Life Research Department'." ”

"So this time my opponent is the 'big muscle' I've seen before?"

Hulk-like sturdy bodies, just looking very difficult to mess with.

Bai Ye secretly decided in his heart that he was still injured, and it was best not to do it if he could do it later.

"The clue to the hidden treasure is also on this level?!"

The fist-sized ball of light had become the size of a basketball, and it was located directly in front of Bai Ye.

There is a glass wall directly opposite, and you can see behind the glass wall from the direction of the elevator.

It looked like a large laboratory, with a total of three doors, facing Bai Ye's direction, and a small door in the center for single people to enter and exit, and there was a password identification lock on the door.

On the left and right sides of the laboratory, there is a wide and thick iron door, the one on the left is open, and the one on the right is closed.

In the middle of the laboratory, there are two glass cylindrical containers with a height of nearly 4 meters, and the surface of one of the containers has broken glass, as if it was caused by brute force, and there are still a large amount of blood stains on the surface of the containers.

But because the ground was filled with white mist, Bai Ye couldn't see the corpse nearby.

"Look, what's escaping from the container? Several tragedies were also created in the laboratory......"

He continued to look at another cylindrical glass container, which was shrouded in a thick white mist that made it impossible to see what was hidden inside.

From time to time, the mist in the container will spray out of the pipe at the top, and after sinking, it will become a 'fog blanket' on the ground.

"I'm afraid those two containers aren't used to make 'big muscles', right?"

Bai Ye observed, and after feeling that there was no danger, he walked out of the elevator door.

Outside the door was a customary empty hallway, and the environment was better than the previous floors, at least there were no obvious signs of destruction, and it was not like the one of the deep divers, which was covered with slippery eggs.

The left and right ends of the corridor are less than twenty meters apart, and each has a thick and wide iron gate, and the iron gate is lit with a green light that means 'passable'.

Bai Ye raised his eyes again and looked at the laboratory behind the glass curtain wall in front of him.

"The 'big muscle' who escaped must still be lurking somewhere in this scene......"

"The three doors in the lab only open the one on the left, so it's likely that the monster escaped through that door, and it should be in the left half of the area now."

"In other words, if I go open the door on the left right now, maybe it will open the door for me from behind."

Bai Ye pursed his lips, raised his leg decisively and walked towards the door on the right side of the corridor.

……

Before arriving at the door, Bai Ye noticed that it was a double-open iron door.

The appearance of the door looks full of science and technology, but it is not an electric induction door, and it is estimated that it was deliberately set to open manually.

The door opening button was located on the left wall of the door, about the height of Bai Ye's shoulder.

Bai Ye stretched out his hand and pressed the button, and the iron door made a soft 'snort', and quickly slid open to both sides, revealing the room behind the door.

At the same time, Bai Ye suddenly received a prompt from the system:

- When one door opens, the other closes!

“？？？”

"What does that mean?"

One on and one off? Can't open two doors at the same time?

Bai Ye seemed to have thought of something, and hurriedly took half a step back, and looked sideways at the back of the glass curtain wall, and the door on the left side of the laboratory was indeed closed!

"I see, that is, every door in this space is bound to the other, one door opens, the other door closes, and only one of the two can be opened."

This is obviously one of the secrets of the system in the current scene setting.

"Interesting, so if you want to crack this level, the first task is to find out which door has a binding relationship with which door, and only by opening and closing it in the right order can you go to the room you want to go."

"What I know now is that the door on the right side of the corridor is bound to the door on the left side of the laboratory, so I'll mark these two doors as Door 1 and Door 2 for the time being."

"The door on the left side of the corridor is not bound to the door on the right side of the laboratory, because both doors are closed, so let's mark them as doors 3 and 5 that are not adjacent to each other."

Since such a rule is set, there must be more than these 4 doors in this scene, mark the order in advance, and Bai Ye can also crack the binding relationship more intuitively.

After making these preparations, he entered the room behind Door 1.

It was a lounge-like room, with tables and chairs overturned in the center of the room, and paper balls and empty folders on the floor.

The lounge is in a standardized square shape, in addition to the entrance wall, there is also an iron door on the other three walls, two doors are closed, and the door on Bai Ye's right hand is open.

"There are a lot of doors."

If you see three doors here, it means that there are also three doors associated with them in another area of the scene.

According to this rule, there are already at least 10 doors in this scene.

"Hmm...... It seems to be getting more and more complicated, so maybe we can change the way of marking and change the original door 2 to door 10......"

Doors that are bound to each other can be sorted relatively, 1 corresponds to 10, 2 corresponds to 9, 3 corresponds to 8, and it is certainly easier to remember than to mark them as you like.

……

"Bookmark for easy reading"