“503456 upgrade points!”

As the system prompt sound appeared, Chen Nuo was shocked first, then relieved.

Then, the corner of his mouth raised.

More than 500,000 upgrade points, good, good, good, good!

"System, use 100,000 upgrade points to buy energy crystals!" Without thinking too much, he directly ordered.

After all, energy crystals are a must-have in materials.

Therefore, the more you have, the better.

"Ding, you spent 100,000 upgrade points to buy 10,000 energy crystals! You have now been deposited in the material warehouse of the scientific research base!"

"Give me four levels of heaters on the second, third and fifth floors of the shelter!"

Chen Nuo pondered for a while and then ordered.

Now it is minus fifty degrees outside, and the heater on the first floor of the shelter is only turned on for thirty degrees, which makes Chen Nuo feel no coldness.

In other words, when it is minus 100 degrees outside, the heater in the shelter should not feel cold if it is about fifty degrees.

Moreover, this is a situation where there is a little cold air coming in the vent.

"Ding, you consumed 1110 upgrade points to upgrade the second, third and fifth floor heaters in the shelter to the fifth level, and the maximum heatable temperature of the heater has been increased to fifty degrees!"

As the system prompt sound appeared, Chen Nuo said again:

“How many upgrade points are left now?”

“402346 points!”

"Elevate the shelter level! Choose to expand the area!" Hearing this, Chen Nuo ordered directly.

"Ding, you consume 12,800 upgrade points to upgrade the shelter, the shelter level is increased to level 10, and the shelter area is increased from 1,600 square meters to 3,200 square meters! The armored door evolved into a primary invisible door with only daytime invisibility. The thickness of the invisible door has been increased from 45 cm to 50 cm, and the thickness of the surrounding walls has been increased from 45 cm to 50 cm!"

...

Hearing this, Chen Nuo was stunned.

A primary stealth door with daylight invisibility?

"What does this mean?" he was puzzled.

"In other words, the current invisible door can only be invisible during the day!" The system answered immediately.

"How can this work? Upgrade! Choose to expand the area!" Chen Nuo frowned, feeling something was wrong.

After all, if only daylight can be invisible, what should I do at night?

"Ding, you consume 25,600 upgrade points to upgrade the shelter, the shelter level is increased to level 11, and the shelter area is increased from 3,200 square meters to 6,400 square meters! The thickness of the daylight invisible door has been increased from 50 cm to 55 cm! The thickness of the surrounding walls has been increased from 50 cm to 55 cm!"

...

Upon hearing this, Chen Nuo frowned and his expression became a little subtle.

"Why is the ability of the invisible gate that can only be invisible during the day? Isn't it increasing the ability to invisible at night after upgrading?" Chen Nuo was a little puzzled.

According to common sense, it should be able to increase the ability to invisible at night.

But, why not?

"No, it's not. Besides, no one stipulates that the ability to invisible at night will definitely increase after upgrading!"

Soon, the system's words made Chen Nuo swallow back if he was about to complain.

"This...a unscrupulous businessman!" Chen Nuo couldn't help but complain.

"Ding, warm reminder, in the next upgrade, the daytime invisible goalkeeper will gain the night invisible ability and become a complete invisible door!"

Suddenly, just as Chen Nuo complained, the system prompt sound appeared.

This made Chen Nuo stunned, and he didn't know what to say...

"Easy up again!" Chen Nuo gritted his teeth, didn't care about anything, and ordered again.

"Ding, you consume 51,200 upgrade points to upgrade the shelter, the shelter level is increased to level 12, and the shelter area is increased from 6,400 square meters to 12,800 square meters! The invisible door increases the invisibility at night! The thickness is increased from 55 cm to 60 cm, and the wall thickness is increased from 55 cm to 60 cm!"

"Host: Chen Nuo!"

"Sanctuary level: Level 12 (upgrade requires 102400 upgrade points!)"

"Sanctuary equipment: 12th-level invisible door, 3rd-level water source station, 4th-level power station, 9th-level scientific research base, 3rd-level automatic lift, 3rd-level breeding farm, 11th-level retreat room, 1st-level simulation practical room, 3rd-level car factory, heater!"

"Remaining upgrade points: 312746 upgrade points!"

...

Looking at the attribute panel in front of him, Chen Nuo felt a sense of accomplishment.

You know, at the beginning, his shelter was only at a level and there were not many equipment.

Now, his shelter is already at level 12 and his equipment is basically complete.

This feeling is like watching the son I raised grow up.

...

"System, how many upgrade points are needed to increase the concentration of the retreat room to 100%," Chen Nuo asked what he thought of.

After all, the third wave of disasters lasted for a month, and he planned to practice hard and strive to reach the Qi Refining Realm.

At least, he must be able to fly with his sword and ignore the bullet's attack!

Now, the concentration of spiritual energy in the level 11 retreat room is only 60%, which is not enough to make his cultivation speed soar.

"Requires 10506400 upgrade points!"

With the system's answer, Chen Nuo was stunned.

"More than 10 million upgrade points?! This..." He couldn't help but take a breath of air conditioning.

However, after calming down, he calmed down.

However, the next prompt sound of the system made Chen Nuo almost unable to breathe.

"Ding, warm reminder, 100% concentration is not the highest. After all, the concentration of spiritual energy is no different. However, the richer the spiritual energy, the faster the cultivation speed will be!"

With the system prompts, Chen Nuo only felt that his situation was smaller.

However, after calming down, he turned to ask:

"How many levels can my remaining upgrade points be upgraded to!"

"Ding, you can upgrade to level 14!"

"That is to say, three levels are increased, and one level can be increased by 5%, so the concentration of spiritual energy after upgrading will be 75%. " Chen Nuo analyzed.

"How many upgrade points will I have left after the upgrade?" He upgraded directly without impulse.

After all, you need to keep a shortcut in everything you do, which was taught by his grandmother.

“23946 points!”

"There are more than 20,000 left, which can be exchanged for some talent pills." Chen Nuo thought, touching his chin.

"Easy!" Thinking of this, he directly ordered.

"Ding, you consume 288,800 upgrade points to upgrade the retreat room to level 14, the spiritual energy concentration in the retreat room increased from 60% to 75%, and the area of ​​the retreat room increased from 200 square meters to 400 square meters!"

With the system's answer, Chen Nuo did not speak, but fell into deep thought.

I suddenly went from getting rich and losing...

After thinking about it, he looked up at the time, and then began to search for the outside world.

However, after seeing the current situation in the outside world, Chen Nuo couldn't help but breathe a sigh of relief.

"It seems that humans don't need to worry about me." After sighing, Chen Nuo went to get a bucket of instant noodles and started having supper.

...

23:44 points.

At this time, the temperature around the world had reached a terrifying temperature of minus 89.3 degrees Celsius!

And, the temperature is still falling!

For a moment, heavy snow covered the entire world, making it vast white everywhere in the world.

At this moment, the Ice Age has arrived!
Chapter completed!