How to upgrade walls and floors in the last day on Earth?

It's important that you know how to upgrade floors and walls in "The Last Day of the Earth: Survival." To build a standard wall on the last day on earth, each piece costs 1 log. You can build them using the build icon in the upper right corner of the minimap. However, once you start to reach higher levels, certain things can only be built on 2 floors.How to upgrade walls and floors in the last day on Earth?

It's easy to upgrade floors and walls on the last day on earth. First, make sure you have at least one floor and wall. Enter build mode by selecting the build icon located below the minimap. You need to get as many pines and limestones as possible, but don't build any walls because the tribe will constantly destroy them and make you lose wood.

Now select the wall or floor and a small tooltip will pop up. You can see the materials needed to upgrade each part. If you have them in your inventory, the arrows will be green and you can upgrade by them. In this tooltip, you can press the left-most icon to destroy the floor and walls and remove them from the base. Another reason not to build a wall is that you will not be attacked unless you are attacking others; if you do, I recommend that you complete the wall upgrade first. At this time, as a new player, the only floor you should build is the floor, because the floor can only be destroyed by you

To upgrade 1 floor to 2 floors, it takes 5 limestone and 5 pine boards. Upgrading a level 1 wall to level 2 costs 10 limestone and 20 pine boards. Upgrading from 2 to 3 floors now requires 10 stone bricks and 5 iron bars. Finally, upgrading a level 2 wall to level 3 will cost you 20 stone bricks and 10 pine boards. In fact, upgrading floors and walls is very expensive. Moreover, it is still easy for zombies to remove the Level 2 wall.

Zombie tribes often cross your base on the last day on earth and destroy walls like they do. Upgrading walls from wood to better wood, to stones, and more helps keep them spaced. You also need better floors to hold certain items. However, it is not immediately obvious how to upgrade walls and floors immediately. 

Click on the saw and hammer icon just like you would build a wall / floor / etc, then click on the wall or floor you want to upgrade to "select" it. Once selected, several options will pop up-with an "x" on the red brick wall (tap this button to destroy your wall / floor), with the required up arrow next to it. If you use the right ingredients (wood planks, stone, bricks, etc.), click the arrow to upgrade your wall or floor.