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
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.
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- 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.

Core systems
Real Time with Pause
You can build and give orders while paused.
Review the situation before resuming.

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.

What players like
Reviews describe satisfaction in holding back hordes with prepared defenses.
Common complaints
Reviewers found restarting after failure burdensome.

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.


85% Very Positive ・ US$29.99
View on Steam ↗Image: They Are Billions on Steam




