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They Are Billions official game artwork

THE PRACTICAL GUIDE

They Are Billions Guide

They Are Billions is a Steampunk strategy game set on a post-apocalyptic planet. Build and defend colonies to survive against the billions of the infected that seek to annihilate the few remaining living humans

Steam ↗Windows
GameWiki Pro EditorialReviewed 5 guide topics

GET YOUR BEARINGS

Plan your next They Are Billions session

Our independent guide breaks down the core systems of They Are Billions so you can build resilient colonies, manage resources efficiently, and keep infected hordes at bay without relying on reflex speed.

01 / THE GUIDE

Optimising Energy Layout

Create two colony layouts: one with a central Tesla Tower cluster and another with dispersed towers. Record energy loss and building upgrade speed, then choose the layout that sustains larger armies.

  • Secure food and energy early in each mission.
  • Research upgrades that improve unit durability.

02 / THE GUIDE

Mercenary Cost‑Benefit Analysis

Track food consumption versus combat effectiveness for three mercenary types over ten in‑game days. Identify which unit offers the best return on resource investment for your current colony size.

  • Adapt building layout to the generated terrain.
  • Watch weather effects that may affect resource gathering.
They Are Billions official gameplay screenshot
Publisher-provided gameplay image · Numantian Games

03 / THE GUIDE

Pause‑Driven Defense Planning

During a wave, pause repeatedly to map enemy approach vectors. Note how many seconds of pause improve wall placement accuracy and reduce colony breaches.

  • Pause to review enemy movement before committing troops.
  • Use pause frequently when expanding the colony.

04 / THE GUIDE

Survival Map Adaptation

Generate two random Survival maps with differing terrain. Adjust building placement to each map’s geography and compare survival duration, highlighting terrain‑specific strategies.

  • Place Tesla Towers centrally to minimise energy loss.
  • Upgrade mills early for a steady food supply.

05 / THE GUIDE

Technology Path Selection

Select three technology branches and simulate their impact on resource gathering, unit strength, and defense. Evaluate which branch aligns best with your preferred strategic approach.

  • Balance mercenary costs with food production.
  • Mix unit types to cover ranged and melee threats.

WATCH THE GAME

They Are Billions videos

Official trailers & gameplay

INSIDE THE WORLD

Screenshots & game images

5 official screenshots

IN THIS WIKI

Your reading checklist

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QUICK ANSWERS

They Are Billions FAQ

Can I play They Are Billions on macOS?

No, the game is listed for Windows only; macOS support is not provided.

Is there a way to sync progress between computers?

Yes, Steam Cloud is supported, allowing saved data to synchronize across devices.

Does the game include a level editor?

Yes, a level editor is included and accessible through the Steam Workshop.

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SOURCES & CREDITS

Official resources and further reading

Original editorial guidance. Game imagery and trailers are provided by the publisher through Steam. Media and reference links checked 2026-10-22. Game versions, supported platforms, and balance can change; consult the linked release notes for current details.