There are many types of buildings in this game, each of them has specific features.

Almost all buildings can be upgraded to higher levels by clicking on them and using the green arrow . This increases your power and grants additional bonuses.

The level of each building is always capped to the current level of the Headquarters (except special Seasonal buildings you will see in Season 1/2).

Contents

Headquarters

The Headquarters is the most important building in the game.

When the Headquarters levels up it will increment:

• Power
• Hero Level Cap
• Hero HP
• Hero Attack
• Hero Defense
• Level Cap for each building

It will also:

• Give EXP rewards (EXP Gains shown in upgrade image)
• Unlock new buildings

Actions

When you click on the Headquarters you can access the following actions:

• Buffs
• Customizations
• Level up

Buffs

Buffs are bonuses that enhance your gameplay, in this section you can explore the aggregated values of your buffs. You can also activate/buy a shield from this section.

Customizations

This menu allows you to customize your base, your chat, etc.

Only few of these customizations are won for free during the game, everything else needs to be bought.

HQ Level up requirements

To upgrade the Headquarters to higher levels, both resources and building requirements must be met at each stage.

It’s crucial to advance construction gradually to facilitate smooth progression to the next level of the headquarters and to spare enough resources. Failing to upgrade the Headquarters may result in having a weak squad, as this building determines the cap for Hero levels.

Use 🔨 Builder Copilot to automatically calculate your level up requirements.

HQ Level 1-30 requirements

Below is the diagram illustrating the buildings required for each level up to level 30:

Here a more explicit table with Resources and buildings requirements:

To unlock the new Headquarters level the locking building must be leveled up to the HQ level before proceeding. Consider that the amounts are an average as it depends on the researches you did.

HQ to unlock	First Building	Second Building	Iron	Food	Gold	Days
2	Drill Ground	Parking lots
3	Wall
4	Barracks	Drill Ground
5	Wall	Barracks
6	Wall	Drill Ground
7	Wall	Any of Tank/Aird/Missile Center
8	Tech Center	Alliance Center
9	Tech Center	Any of Tank/Aird/Missile Center
10	Tech Center	Hospital
11	Tech Center	Wall
12	Tech Center	Barracks
13	Tech Center	Any of Tank/Aird/Missile Center
14	Tech Center	Drill Ground
15	Tech Center	Wall
16	Tech Center	Alliance Center
17	Tech Center	Any of Tank/Aird/Missile Center
18	Tech Center	Hospital
19	Tech Center	Wall
20	Tech Center	Barracks
21	Tech Center	Any of Tank/Aird/Missile Center	79.3 M	79.3 M	25.6 M	~3.8
22	Tech Center	Drill Ground	105.6 M	105.6 M	33.6 M	~5.5
23	Tech Center	Wall	131.6 M	131.6 M	41.3 M	~6.4
24	Tech Center	Alliance Center	158.9 M	158.9 M	50.4 M	~8
25	Tech Center	Any of Tank/Aird/Missile Center	270 M	270 M	96.5 M	~11.5
26	Tech Center	Hospital	374 M	374 M	121.5 M	~15
27	Tech Center	Wall	487.6 M	487.6 M	156 M	~22
28	Tech Center	Barracks	691.9 M	691.9 M	224.4 M	~30
29	Tech Center	Any of Tank/Aird/Missile Center	925 M	925 M	305 M	~39
30	Tech Center	Drill Ground	1280 M	1280 M	425 M	~46

HQ Level 31-35 Requirements

With Season 2 Celebration‘s new The Age of Oil research tree, it will be possible to level up the Headquarters up to level 35.

To unlock the level up the HQ 31-35 feature you first need to complete the “HQ Expansion Lv1” research of The Age of Oil tree.

The pace of leveling up HQ31-35 is dictated by the requirement of oil, that can only be produced for a certain amount per hour, so it will take a while to reach HQ31. Here are my best timings doing everything as fast as possible:

• After exactly 1 week and 4 hours I was able to start Oil Output I Level 10 research
• After exactly 2 weeks and 4 hours I was able to start Oil Output II Level 4 research and I have 50k oil leftover
• After exactly 3 weeks and 4 hours I was able to start Oil Output II Level 8 research
• Starting from week 3 oil packs will be available but I will continue this list as free to play to give people an indication without purchases.
• After exactly 4 weeks and 4 hours I was able to start Oil Output III Level 1 research
• After exactly 5 weeks and 4 hours I was able to start Oil Output III Level 10 research and I have left 130k oil
• After 6 weeks and a few hours I was able to start HQ31, without purchasing oil.

HQ Expansion Lv1 research requirements

To know all the details to obtain the “HQ Expansion Lv1” please visit this link: Google Spreadsheet Age of Oil Researches

Once I have all the resource/time for the mandatory path I will add here the summary.

Level 31-35 building requirements

Here are the building requirements for the HQ 31-35.

Use 🔨 Builder Copilot to automatically calculate your level up requirements.

Headquarters Lv31

• Research Center Lv30
• Tank, Air or Missile Center Lv30
• Barracks Lv30
• HQ Expansion Lv1

Headquarters Lv32

• Research Center Lv31
• Tank, Air or Missile Center Lv31
• Barracks Lv31
• Wall Lv31

Headquarters Lv33

• Research Center Lv32
• Tank, Air or Missile Center Lv32
• Barracks Lv32
• Hospital Lv32
• Drillground Lv32

Headquarters Lv34

• Research Center Lv33
• Tank, Air or Missile Center Lv33
• Barracks Lv33
• Wall Lv33
• Alliance Center Lv33

Headquarters Lv35

• Research Center Lv34
• Tank, Air or Missile Center Lv34
• Barracks Lv34
• Hospital Lv34
• Drillground Lv34

Builder’s Hut

At the beginning of the game, when your base level is lower than 15, the Builder’s Hut can be your best friend.

This building allows to gain Free Speed-up Time. By maintaining this building’s level aligned with the Headquarters, you’ll be able to swiftly level up numerous other buildings.

As you progress to higher levels, the effectiveness of these speed-ups diminishes, given the significant resource investment required to upgrade the building. It may not be wise to spend all those resources for a mere one-minute gain per building level.

Actions

When you click on the Builder’s Hut you can access the following actions:

• Survivors
• Builder upgrade
• Level up

Survivors

In this section you can see which survivors are working in this building. You can also change one with another active one that might give a bigger bonus.

Builder upgrade

It is possible to buy additional builders.

To keep up with the game pace it is wise to at least buy a second builder.

Gold Mine / Iron Mine / Field

These three buildings are the most important regarding resource production.

They allow to produce:

• Coin
• Iron
• Food

Coin/Iron/Food

The amount of Coin/Iron/Food resources immediately available goes into the counters at the top of the screen:

These resources are immediately available to be used to level up buildings, carry out research, etc.

Fields and mines

It is important to obtain, upgrade and best manage iron and gold mines.

When new survivors arrive, it’s advantageous to allocate them to production buildings, concentrating them all in one to expedite its growth compared to others.

With such bonuses, even if all gold mines aren’t at their highest level, having one with the highest level, enhanced by survivors, can significantly boost overall gold production per hour.