When clearing the level, the first choice weapon is the rocket launcher, mainly because it clears troops quickly. Thanks to the skill of connecting points to load and fire one round, the rocket launcher's rate of fire is directly linked to the speed of reloading, eliminating the need to upgrade the magazine capacity. Let's You can add a few more skills.

The next step is to line up the troops. Place machine gunners, two rocket turrets, and two rifle turrets on the four corners. Place them diagonally (it shouldn’t matter if you don’t put them diagonally). The guards feel that they have little effect and the rate of fire is slow. , the range is short, you can buy it if you have money, but it’s okay if you don’t buy it if you don’t have money.

It is best to upgrade the shelter shield repair and simple shield, especially the shelter shield repair, because the remote monsters in the fourth difficulty are very good at stealing homes. The shelter shield should be upgraded as many levels as possible, and the ice wall should be upgraded to Level 3 feels almost enough, the rest is optional.

Then there is the in-game upgrade. For special upgrades, just use weapons. If you don’t play swarm rockets, don’t use the bombardier. Installing a rocket launcher that fires one round will not trigger the bombardier effect. For ordinary upgrades, priority is given to level 3 reloading, because it will not trigger the bombardier effect. Fast bullets are equal to fast firing speed, and then there are the range and cooling of the secondary weapon (priority cooling). The damage of the secondary weapon is optional. The main function of the secondary weapon is to offset the missiles of long-range monsters. The output still depends on the hand. Rocket launcher, and then weapon damage. When there is no armor and shock wave, you can give priority to armor and shock wave. Just have one layer of armor to save your life. Other times, when there are no good options for upgrading, choose armor and two or three shock waves. That’s enough, remember to replenish it after using it (generally, in the later stages, you will have several armors and shock waves, because sometimes there are no good upgrade options)

That’s pretty much it, I wish you all a speedy clearance!