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They Are Billions: the colony you want and the border you can defend

They Are Billions:A train on the tracks beside a town
A train on the tracks beside a town1 / 10

Reviews enjoy the tension of expanding a colony into danger. Its appeal lies in the conflict between securing your defenses and pushing outward to develop.

What makes it fun

  1. Every expansion needs defending

    Claiming land brings in resources, but it also stretches your defenses. Deciding how far to push before the next horde gives every expansion weight.

  2. Watch your defenses hold

    You turn a growing economy into walls and troops before the horde arrives. When the infected hit the line you planned and it holds, the preparation pays off.

Game details

As of Oct 29, 2026
Playtime at review
83.2 hoursMedian at the time of review (based on 100 helpful reviews)
Languages
Japanese, English (Full audio), Simplified Chinese, Korean / 12 languages total

A typical run

Gather resources, build a colony and defend it from infected hordes.

A train on the tracks beside a town (They Are Billions, via Steam)
A train on the tracks beside a town (They Are Billions, via Steam)

Core systems

Real Time with Pause

You can build and give orders while paused.

What to decide

Review the situation before resuming.

A city with Foundry information on screen (They Are Billions, via Steam)
A city with Foundry information on screen (They Are Billions, via Steam)

What sets it apart

A veteran describes slow expansion stalling land and income, but rushing it provoking powerful enemies. They enjoy balancing secured ground with further expansion and have actually reinstalled to play again.

Learning curve and difficulty

One player finds early resource management crunchier than they prefer, but loves seeing the defenses enabled by that preparation stop the horde.

Flames striking a horde of infected (They Are Billions, via Steam)
Flames striking a horde of infected (They Are Billions, via Steam)

What players like

Reviews describe satisfaction in holding back hordes with prepared defenses.

Common complaints

Reviewers found restarting after failure burdensome.

Infected surrounding a town beside snowfields (They Are Billions, via Steam)
Infected surrounding a town beside snowfields (They Are Billions, via Steam)

Who it’s for

Players who want to weigh expansion risks against defensive preparation.

Who might not enjoy it

Players who want to avoid restarting after defeat.

A smoking machine among green tanks (They Are Billions, via Steam)
A smoking machine among green tanks (They Are Billions, via Steam)
They Are Billions
They Are Billions

85% Very Positive ・ US$29.99

View on Steam ↗

Image: They Are Billions on Steam