they are billions campaign guide Complete Campaign Walkthrough and Best Strategies

6 August 2026 | 78

Conquering the steampunk infected world of They Are Billions requires a delicate balance of tactical foresight and economic efficiency. The single-player campaign challenges players to reclaim a fallen empire by establishing heavily fortified colonies across diverse and unforgiving landscapes. Navigating this linear progression system demands a deep understanding of unique tech trees, choke points, and resource management to withstand overwhelming swarms.

Navigating the Empire Tech Tree

The progression of your empire relies entirely on the research points accumulated during regular missions and tactical hero scenarios. Choosing the correct technologies early on dictates your survival capabilities in later stages of the campaign. Prioritizing logistics, such as early farm upgrades and improved train deliveries, ensures a steady influx of gold and raw building components.

Unlocking early defense mechanisms like the Ballista or upgrading to sturdy stone walls provides the necessary security framework to expand your boundaries safely. Many players face severe setbacks by prioritizing advanced combat units before establishing a self-sustaining economy. A balanced approach ensures you can continuously fund production lines while slowly pushing into uncharted, hostile territories.

Mastering Early Game Economy

Every successful colony begins with a rapid expansion phase focused on securing basic food networks and housing blocks. Placing tents efficiently near marketplaces and banks maximizes your gold income per tick while preserving valuable green space for farming fields. Managing your early resource balance ensures that production queues for new rangers never stall during critical exploration phases.

Securing choke points using simple wooden walls and isolated patrols prevents early infiltration from roaming infected walkers. Utilizing the natural layout of mountains and forests drastically reduces the total number of defensive structures required to seal your perimeter. This structural efficiency frees up precious wood and stone reserves to accelerate your tech advancement.

Defending Against Massive Swarms

The true test of any settlement occurs when massive infected hordes march directly toward your outer perimeter. Standard walls are rarely enough to stop advanced variants, requiring deep defensive networks composed of double walls and shock towers. Positioning veteran soldiers on high ground behind the barriers provides optimal firing lines to shred incoming crowds before they breach your lines.

Creating layered evacuation sectors within your base protects your central command center if a single sector collapses under intense pressure. Regular maintenance, such as repairing broken gates immediately after skirmishes, keeps your structures at peak health. Staying adaptable during these chaotic events determines whether your imperial expedition succeeds or crumbles into dust.

Tactical Missions and Hero Exploits

In addition to building expansive settlements, players must complete narrow tactical infiltration missions using a single chosen hero character. These segments provide the vital empire points needed to bypass difficult roadblocks on the main campaign map. Searching every dark corridor thoroughly reveals hidden artifacts that instantly boost your total research score.

Kiting slow moving infected using long-range firearms allows you to clear heavily crowded rooms without taking unnecessary damage. Managing health packs wisely ensures your hero remains in fighting shape for the final room encounters. These specialized scenarios offer a refreshing change of pace while fueling the overall growth of your imperial forces.