Seeing the small black ball in the mind of the second-level zombie, Lin Feng was not as annoyed as an ordinary hunter, but had a happy expression.

The probability of the black ball being produced in the brain of a second-level zombie is extremely low, Lin Feng doesn't know how he formed it, and he also doesn't know if this black ball is of other use, at least some of the people Lin Feng met before, the black ball is useless to them.

But unlike Lin Feng, the black ball can form a super energy exchange system in the supermarket through the experiments done before. The super energy exchange system is only level 1 now, and whether the black ball can upgrade the super energy exchange system remains to be tested.

It wasn't that Lin Feng hadn't considered the acquisition of the black ball before, but after thinking about it, he vetoed the matter again.

The black ball is known to be a useless thing, and people were originally very frustrated when they killed the black ball obtained by the second-level zombie with great difficulty. And at this time, if Lin Feng buys a large number of black balls, it means that it is useful, so that someone will definitely come to study the matter of black balls, and Lin Feng can't explain the other uses of black balls, so in order to avoid unnecessary trouble, Lin Feng still gave up this idea.

Seeing the appearance of a black ball, Lin Feng picked up the ball and entered the supermarket. Coming to the front of the super energy exchange system, after hesitating for a moment, Lin Feng put the black ball into the recovery port of the super energy exchange system.

A few seconds passed, and in Lin Feng's apprehensive mood, a progress bar appeared on the big screen on the super exchange system again, and the progress of the progress bar was displayed as one percent.

It really works!

Sure enough, just as Lin Feng thought, the black ball in the second-level zombie's brain could really upgrade the super energy exchange system in the supermarket. As for what the upgraded super energy exchange system would look like, Lin Feng was a little looking forward to it. The things in the super exchange system that have not been upgraded are already so powerful, and the upgraded super exchange system may have more than one level of items that can be exchanged in it.

It's just that now one black ball can only add one percent of the progress to the upgrade progress bar of the Super Exchange System, which means that it takes a full hundred black balls to upgrade the Super Exchange System.

Originally, the probability of the black ball spawning in the second-level zombies was very small, and it was necessary to wait until a hundred upgrades were gathered, and I didn't know if it would have to wait until the Year of the Monkey and the Moon, thinking of this, Lin Feng couldn't help but be a little frustrated.

Putting away the mixed mood, Lin Feng returned to the car and continued to march in the direction of Tianheng Mountain.

As the distance from the Tianheng Mountain Range got closer and closer, the number of zombies Lin Feng encountered became more and more, and when he was a kilometer away from the Tianheng Mountain Range, Lin Feng had already consumed nearly a thousand rounds of ammunition. Even the first-level zombies eliminated reached as many as eighty.

Lin Feng didn't take out the white crystals from the brains of these first-level zombies, now that Lin Feng had more than 100,000 white crystals on hand, there was no time to earn white crystals from the brains of these first-level zombies one by one. When he encountered that second-level zombie before, if it wasn't for the sake of familiarizing himself with the sword technique, Lin Feng would never waste time.

During this period, Lin Feng also encountered three second-level zombies. This time, Lin Feng did not slowly deal with them, but quickly eliminated the three second-level zombies. After killing these second-level zombies, Lin Feng obtained three pale yellow crystals from their heads.

Lin Feng, a high-level zombie, didn't know that in this apocalypse, it was well known that killing a first-level zombie could get white crystal. And killing a second-level zombie, except for a small percentage of the chance of getting a black ball, most of them are from the brain of a second-level zombie to get a light yellow crystal. The energy in the light yellow crystal is ten times that of the white crystal, not only the amount of energy, but also in terms of mass, the energy concentration of the light yellow crystal is several times more than that of the white crystal.

The brain of the third-level zombie is a dark yellow crystal, and the energy and concentration are several times more than that of the light yellow crystal of the second-level zombie. And the brain lost by the fourth-level zombie is the green pill, the fourth-level is light green, and the green pill in the fifth-level zombie's brain is dark green. As for what the effect is, it is unknown.

After that, not to mention Lin Feng, it is estimated that those level 7 cultivators have never seen it. Legend has it that a 5-odd loss can fall to a medium and large base, and this powerful zombie is not something that can be seen casually.

It is said that the strength of zombies of the same level is also strong and weak, just like the two fourth-level zombies encountered before, the female fourth-level zombie encountered first is obviously not as powerful as the male fourth-level zombie that he teamed up with Dong Wu to kill later.

Depending on the degree of evolution of zombies, their strength will naturally vary. It's the same as humans, for example, people who are also cultivators level 4 also have a gap in their abilities.

Seeing that there were more and more zombies in front of him, the car was no longer suitable for further entry. Finding a secluded place and parking the car, Lin Feng prepared to walk into the mountain.

Fortunately, the thermal weapons and bullets that Lin Feng had purchased at the Nanshan base before were sufficient, and in the unknown situation, he had to reserve more ammunition. In the kilometer close to the Tianheng Mountain Range, Lin Feng observed through the telescope that there were at least three hundred zombies in front of him. These zombies all walked out from the narrow entrance of Tianheng Mountain, which is steep and steep, and the entrances and exits are very narrow. The zombies themselves have no intelligence, and they walk casually, forming a dense gathering of zombies at the entrance.

Took out a six-barreled machine gun from the Doomsday Table, this was the most powerful gun that could be bought in the weapons shop of the Nanshan base, and it cost Lin Feng 1,000 white crystals.

The six-barreled machine gun has a bullet capacity of 200 rounds, and the price of a single bullet is one white crystal per round. A bullet may not be able to accurately kill a Tier 1 zombie, but the price is equivalent to the White Crystal obtained by killing a Tier 1 zombie.

Of course, this is an exception for Lin Feng, who set up a six-barreled machine gun, stuck the whole plate of bullets on the machine gun, and aimed at the nearest zombie, Lin Feng pulled the trigger.

The giant fiery snake roared out of the barrel of the six-barreled machine gun and scurried towards the zombies on the opposite side, as if it were about to tear everything on the other side.

The rate of fire and power of the machine gun are very powerful, and many times after a bullet penetrates the body of the zombie in front of it, it directly punches the body of the zombie into a big hole. And after passing through the body of the zombie in front, the power did not decrease, and continued to fly towards the zombie behind.

A whole plate of 200 bullets, under Lin Feng's not very accurate marksmanship, actually shot more than fifty zombies, mixed with several first-level zombies. The size of the first-level zombie is obviously larger than that of ordinary zombies, which is very easy to identify.

Just when Lin Feng secretly praised the power of the six-barreled machine gun, a skinny zombie suddenly sprang out from the opposite side, unlike other zombies, this zombie landed on all fours, like an animal, and ran towards Lin Feng's side, the speed was much faster than that of the second-level zombie.

Level 3 Zombies!

Seeing the zombies running away more than a hundred meters away from him, Lin Feng was shocked.