Xiao Chen hurriedly stepped forward to inspect it, and tried to pick up the marks with his hands again, but was unsuccessful.

I felt that if I wanted to take these things away, I still had to use the special knife of the moon spirit.

Chen Meng said: "We didn't have these ghost traces when we came last time, so there must have been ghosts that were eliminated here later." ”

Xiao Chen nodded, but he was a little strange......

Considering that he had seen and photographed the various devices and tools here, he could conclude that this place must be conducting some research related to ghosts.

Therefore, if there is a ghost other than Xiao Chen in this place, it is likely that it was made up by the pharmaceutical company itself, and it must be under their control.

So now that these ghosts have been eliminated, does it mean that there are other invaders besides Xiao Chen and them?

Xiao Chen instantly thought of Ding Wu and Amy, but these two were extremely embarrassed after sneaking in at that time, if it wasn't for Xiao Chen's action, it was likely that they wouldn't be able to run away. Could it be that they have called for more support? And then serve it in a pot?

Next, Xiao Chen began to investigate the nearby ground and wall more carefully, but found no trace of a fight.

Xiao Chen became more and more difficult to understand......

Chen Meng also tried to take away those ghost traces at this time, but even Xiao Chen couldn't pick it up, let alone Chen Meng.

In the end, Chen Meng used the flashlight that Yue Ling gave her to shine on these ghost traces for a while, and then Xiao Chen found that these traces gradually disappeared.

It turns out that this flashlight still has this effect, which also shows from the side that the lethality of this thing to ghosts is indeed terrifying.

After leaving this second area, they arrived at the last large room in the Level 3 area, where the suspended observation platform was built on all sides.

Before, Xiao Chen was worried that he couldn't find any traces of the fight, but in this room...... Traces of the fight are everywhere.

First of all, there are traces of ghosts on the ground, which can almost be described as dense, and you can imagine how many ghosts have been eliminated here.

Then there was the large glass room in the center, which was now shattered to slag from the outside to the inside, and blood could even be seen in some places. Not to mention the suspended observation decks around them, at least half of them were damaged and fell, while the other half were not much better, and some blood was also seen on them.

"It looks like here...... There have been battles before! Chen Meng was obviously a little scared: "Could it be the battle between people and ghosts?" ”

Xiao Chen felt a bit like it, after all, there were traces of blood and ghosts here.

At this time, Xiao Chen glanced up at the ceiling, only to find that even the ceiling had some traces of white sticky-thick ghosts.

There was such a fierce battle here, and the security guards in the factory didn't know about it?

Soon Xiao Chen's gaze fell on the edge of the side windows, and then he saw that these windows were all intact.

Chen Meng walked to the window, then lightly touched it with his hand and said, "This doesn't seem to be ordinary glass. ”

After hearing this, Xiao Chen immediately stepped forward and touched it, but he didn't feel anything special.

I only heard Chen Meng say: "You try it...... Can you use the wall piercing technique? ”

Xiao Chen nodded, tested it, and then was surprised to find that the wall piercing technique really had no effect on the glass here!

"See, this area is supposed to be used to prevent ghosts from escaping." After Chen Meng finished speaking, he pointed to the eaves of the wall next to the window and said, "If you look at the thickness of this wall, I'm afraid it is far beyond the scope of your intermediate wall piercing technique." ”

That's true...... Xiao Chen found that the thickness of this wall was almost four or five times that of an ordinary wall, not to mention the intermediate wall piercing technique, even if it was a wall piercing technique that was upgraded to another level, it might not be possible.

Xiao Chen suddenly felt a little psychologically stressed, because this place was designed to be so aimed at ghosts, and he happened to be a ghost...... So the deeper he goes, the more he feels like he's in the net.

However, being held back by the main quest, Xiao Chen could only continue to move forward.

At this time, the Level 3 area had been fully explored, and they had planned to take the elevator to the fourth floor, but unsurprisingly, the elevator here had already been paralyzed.

They had no choice but to march through the safe passage.

The safe passage was also blocked by the security door, but the security door had also been unlocked a long time ago, and Xiao Chen still opened it with a push.

There was blood in the hallway, not much, but the length was exaggerated, stretching from the end of the staircase to the top, and it looked like a wounded man had left it all the way.

Chen Meng's breathing had become very short, and she had already turned on the flashlight and shone it upwards, but there was nothing on it.

Xiao Chen walked along the bloodstain to the top of the stairs at the moment, and found that the bloodstain had been extending behind another security door.

He was just about to push the door when he heard Chen Meng say, "Don't move!" Don't touch that door! ”

Xiao Chen's hand stopped abruptly halfway through, and Xiao Chen's palm at this time was less than an inch away from the door, and then Xiao Chen felt an obvious flow of energy on the door wall in front of him, and at the same time, Xiao Chen did find some faint streamers on the door.

The reason why Xiao Chen didn't see it at first was because his mind was not on the door at all, but only focused on the blood stain that stretched on the ground.

"This should be an alarm." Chen Meng said: "You want to touch it...... I'm afraid the mission will fail! ”

Xiao Chen said in disbelief: "No, there was also this kind of streamer on the door of the ghost house before, and I didn't see that it was connected to the alarm." ”

"Look here." Chen Meng pointed to a baffle in the center of the security door and said, "There is no such thing on the other security doors, but it is the only one!" ”

As he spoke, Chen Meng shone his flashlight on the baffle again, and then Xiao Chen was surprised to find that a line of blue fluorescent font appeared on the baffle: The road is not bending

"What ......" Xiao Chen was a little speechless, and the words on this door gave him a feeling of being headless and brainless.

"Diameter!" Chen Meng said.

"Huh?" Xiao Chen was still puzzled, and the font on the baffle had a new change: two bulls fighting.

"To the top corner!" Chen Meng said again.

The words on the bezel continue to change: go hand in hand

"Parallel lines!"

Xiao Chen reacted at this time, this is actually a mathematical riddle......

It's also a kind of puzzle, this is Chen Meng's strong point, no wonder the quest will reward her favorability.

Chen Meng answered ten riddles correctly in a row, and then the baffle turned into a cloud of green smoke and disappeared, and the door was opened.

Xiao Chen cautiously stepped into it, and after finding that it was okay, Chen Meng followed.

"It's kind of magical." Chen Meng has just recovered from the pleasure of answering the question, and it seems that he is still a little unsatisfied.

What's more, the kind of scholarly experience just now also freed Chen Meng completely from his previous fear.

"Looks like the ghosts here are interested in math." Chen Meng said, "If you can...... I'd love to talk to them......"

Xiao Chen laughed dryly, and then pointed to the blood stains on the ground, reminding Chen Meng to retract his thoughts.

Chen Meng nodded hurriedly, and then began to follow Xiao Chen along the bloodstains and continue to walk.

The blood stains on the ground actually looked quite "fresh", and there was no sign of drying up, Xiao Chen felt that the blood was very likely to have been shed within an hour.

According to previous map observations, there are only three rooms on the third floor and fourth level here, each of which is less than 100 square meters in size, and they are connected together.

Now Xiao Chen and Chen Meng were in the corridor outside the first room, and the blood stains turned along the corridor to the first room.

Just as Xiao Chen was still observing if there were more alarm traps nearby, he suddenly heard a woman's voice appear in the first room closest to them.

The voice sounded a bit hollow, and even had some echoes.

What's even more bizarre is that this voice sounds like a teaching! The content of the teaching should be arithmetic, because Xiao Chen heard some multiplication formulas.

Chen Meng immediately nodded beside Xiao Chen and said, "This ghost...... It's supposed to be a math teacher! So the three rooms here should be classrooms! ”

Xiao Chen frowned, and a sense of fear welled up in his heart, because in this environment, listening to a ghost teacher give a lecture...... I couldn't help but let Xiao Chen

I wonder if there will be more student ghosts in the classroom ahead!

So the question is, how can there be classrooms and teachers in a pharmaceutical company?

Contacting the small dormitories on the ground floor, Xiao Chen even wondered if there had been a kindergarten or primary school here before.

Xiao Chen approached the door a little bit, and then glanced sideways inside.

Sure enough, a vague figure was shaking on the podium, but Xiao Chen could tell at a glance that this was not a ghost, but the same as the little child figures he had seen in the level 2 area before, this was just the remnants of some ghost's thoughts.

Also, there were no other ghost students in the classroom.

Xiao Chen breathed a sigh of relief, and now the fear disappeared for the time being, as Xiao Chen's idea of obtaining ghost points rose and completely suppressed the fear.

Last time, Lin Yuan grabbed some of his ghost points from the side, but this time it will definitely not happen!

He quickly ran a few steps towards the podium, and now the phantom's face was more clearly visible, it was indeed a female teacher's dress, but before Xiao Chen could take a closer look, he found that the phantom disappeared in an instant, and the voice of the lecture was gone.

Bite!

The system indicates that Xiao Chen's ghost points have increased by 1500 points.

Although there are many fewer than the last time, there were many children at that time, and now there is only one female teacher here, and 1500 points is already a lot.