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. Can humanity survive after the zombie apocalypse? Summary: IGDB
Mind Score
Fair to the playerAge · PEGI 16
Respect
90
Stimulation
lively
Has an endingStop anytime
On failure
Punishing: a death costs progress or a long way back
- 5 of 50 reviews mention harsh death penalties
- From a player review (1 found it helpful)
What it exercises
Planning and strategy
- Steam tag “Resource Management” (346 votes)
Problem solving
- Steam tag “Tactical” (226 votes)
High confidence · 27 Sept 2026 · Rules-based estimate from the Steam store, player reviews and PEGI/ESRB descriptors. Not a substitute for the official rating or your own judgement. Tap a label to see the evidence.