Which Buildings Should You Upgrade?

One of the easiest ways to slow your HQ progression is spending resources on buildings that don't help unlock your next HQ.
HQ8–30 Requirement Pattern
From HQ8 through HQ30, the supplied guide identifies the Laboratory as mandatory for every HQ upgrade.
The second required building rotates among:
City Walls
Alliance Center
Assaulter Camp
Shooter Camp
Rider Camp
Think of your progression as:
Laboratory + Required Rotating Building → HQ Upgrade
For HQ31–35, requirements should instead be planned level by level using the later-game requirements.
Buildings to Avoid Upgrading Too Early
Unless they're required for your next HQ or serve an immediate strategic purpose, avoid pouring resources into:
Resource production buildings
Hall of Honor buildings early in progression
Random buildings simply because they show a blue upgrade arrow
A blue arrow means you can upgrade something—not necessarily that you should.
Useful Optional Upgrades
When resources and construction time allow, the supplied guide identifies these as useful:
Formation buildings
Military Center
Bookstore
Restaurant
Production Center
Rally buildings
Radar
The HQ Progression Rule
For players trying to reach higher HQ levels efficiently:
Upgrade what your next HQ requires first.
Then use spare construction time and resources for secondary buildings that provide meaningful benefits.
Final HQ35 Planning
By the time you're approaching HQ35, your progression should be deliberate rather than reactive.
Remember the big numbers:
HQ30 → Hero Cap 150
HQ35 → Hero Cap 175
HQ31–35 → 21.1M Total Steel
Plan the required buildings, Steel, speed-ups, construction bonuses, and event timing before pressing Upgrade.