System: My Doomsday Train-Chapter 580 - 291: Gray-grade components._4

"..."

Chen Mang squinted slightly as he looked at the control screen.

Upgrading from level 17 to level 18, the cost for one wagon is 30 million.

Upgrading from level 18 to level 19, the cost for one wagon is 50 million.

Upgrading from level 19 to level 20, the cost for one wagon is 100 million.

The gap is huge!

Especially from level 19 to level 20, the price doubled, but upgrading to level 21 demands much less, only requiring 120 million units of iron ore.

Just 1.92 billion.

After the upgrade material consumption is halved, it is 960 million units of iron ore.

Once 960 million units of iron ore were pulverized within the train, the "armor" component smoothly reached level 21, providing a bit of extra peace of mind even when venturing into the pink zone. A level 21 armor can indeed provide a lot of security.

For instance, should he encounter the Withered Wood Spring map, he could simply stop and remain motionless, as no monster could break through his defenses, although the real challenge of that map is how to kill all the zombies in a short amount of time.

Perhaps there was enough iron ore within the train.

The "armor" component’s upgrade is always the biggest expense within the train, but even after upgrading the train armor by another level, there were still 1.852 billion units of iron ore left.

Too much.

Enough to upgrade by another level.

"..."

After contemplating briefly, Chen Mang decided to upgrade another level. The level 21 armor might feel inadequate in the pink zone; level 22 would be nearly sufficient. At this armor level, even level 24 monsters wouldn’t be able to easily destroy the armor.

And within that time.

His 9 "Doomsday Cannons" would have already begun roaring.

Since the last time a two-headed monster smashed one of his Doomsday Cannons in the train tunnel, he has not replenished it with a new one.

He’s been making do like this.

Saving resources for now.

Wait to visit the Seven-Color Region to acquire Seven-color Level weapons, then upgrade.

Upgrade the armor once more!

After he made the decision internally, a portion of the iron ore in storage wagon No. 3 was again consumed and infused into the wagons, bringing the train armor level to 22!

This upgrade consumed another 1.12 billion units of iron ore.

Having just accumulated a little, it nearly depleted again, leaving only 732 million units of iron ore!

This amount will be used for upgrading the train and as a backup, not upgrading the armor for now.

Level 22 armor will suffice for the short term.

"..."

He looked towards the upgrade conditions for the level 20 train.

-

"Upgrade Conditions": Consume 110k units of level 3 iron ore, require all components within the wagons to exceed level 300, and any one train defense component and any one train attack component each exceed level 18.

-

"Done."

That was his first reaction upon seeing these upgrade conditions; the previous few conditions were met and were simple, only the last condition required any train defense component to reach level 18.

As seen in the red zone.

Most defensive components of a Doomsday Train struggle to reach level 18, with few reaching even level 15 or 16.

This condition is extremely demanding.

The higher the grade of the components, the more iron ore is consumed in upgrading.

The "Wagon Steel Armor" component is a green component, consuming very few resources, plus it carries the manufacturing half-consumption Supermodel Effect. Upgrading his train defense components is already challenging enough, let alone for others.

His current armor is only level 22.

How high can others possibly get, could they be higher than his? Likely, few people are in the pink zone.

Soon——

After 11 million units of iron ore were pulverized within the wagons, a familiar line of text appeared on the screen.

-

"Your train has been upgraded to level 20."

"No additional craftable components have been unlocked."

-

Level 20 train!

Upgrading to level 20 train didn’t add any new functions, nor any craftable components, just like usual. Apart from a slight change in train speed, there was basically no change.

"A transition?"

Chen Mang thoughtfully looked at the control panel, having reached the golden zone "Deep Sea Island," upgrading to level 19 train, heading to the pink zone after reaching level 21, and then upgrading the train once more in the pink zone.

Level 10 was a threshold.

He originally thought level 20 would be a threshold too.

But surprisingly, it turned out to be nothing.

He glanced again at the upgrade conditions for the level 21 train, almost unchanged, simply needing 1 million more units of iron ore for the upgrade, with no further conditions.

That being the case.

Without hesitation, Chen Mang consumed another 12 million units of iron ore. The familiar screen appeared on the train control panel once more.

"Your train has been upgraded to level 21."

"No additional craftable components have been unlocked."

"It seems..."

He stretched and leaned back in the chair. The next minor hurdle was at level 22, with the level 22 train task considerably more difficult, even the Fixed Star is currently not up to standard. This was likely the hurdle when upgrading to level 22 train in the pink zone.

There was a special addition.

"...hold a memorial using the ’Doomsday Death Certificate’..."

He had already sent people to buy it in Neon City.

Anyway, he had not seen it.

Nor did he know if it could be acquired in Neon City.

If not, it would be tough to reach level 22 train in a short time.

But he could take his time collecting it, no rush. What he needs to do now is head to the "Pink Zone," which is connected only to the Pink Zone, an island near the equator.