They Are Billions cover art

They Are Billions

2019Numantian GamesPlayStation 4, Nintendo Switch 2, PC (Microsoft Windows), Xbox One

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?

What it feels like

Sustained edge-of-seat pressure where waves of billions of infected feel imminent and devastating. An unflinching darkness of human extinction and brutal survival permeates the world.

Tense75%
Grim55%

What it's about

An undead outbreak of billions of infected creatures is the core existential threat. Survival amid the ruins of civilization on a post-apocalyptic planet is the foundational setting. Enduring waves of hostile infected seeking to destroy remaining human settlements is the central struggle.

Zombie85%
Post-Apocalyptic80%
Survival Against Nature75%

How it plays

Real-time strategy commanding of economies, defenses, and unit placement is the core loop of colony management and survival. Constructing and expanding a functioning human colony with buildings and infrastructure is the defining gameplay focus. Placing defensive structures and managing perimeter barriers to repel waves of incoming infected is central to survival.

Real-Time Strategy95%
Base Building90%
Tower Defense85%
Resource Management80%
Colony Sim75%
Real-Time with Pause70%
Level Editor & UGC40%

How it looks and sounds

The game employs an isometric fixed-angle perspective for viewing and managing the colony. Steampunk aesthetic with industrial machinery and retro-futurist design elements shape the visual identity.

Isometric70%
Retro 3D50%

How it's structured

Designed as a single-player experience focused on solo colony management and defense. Gameplay continues indefinitely against escalating waves until the colony falls, chasing survival as long as possible. Campaign maps are deliberately authored by designers, though a level editor allows player-created content.

Single-Player85%
Endless65%
Handcrafted World60%
High Replayability60%

Shares Real-Time Strategy, Tower Defense, Resource Management, Base Building.

Both lean into Real-Time Strategy, Tower Defense, Resource Management, Base Building.

Real-Time Strategy90%Tower Defense85%Resource Management75%Base Building60%

Shares Zombie, Survival Against Nature, Post-Apocalyptic, Tense.

Both lean into Single-Player, Zombie, Survival Against Nature, Tense.

Single-Player85%Zombie80%Survival Against Nature80%Tense80%

Shares Real-Time Strategy, Post-Apocalyptic, Base Building, Resource Management.

Both lean into Real-Time Strategy, Post-Apocalyptic, Base Building, Resource Management.

Real-Time Strategy95%Post-Apocalyptic90%Base Building80%Resource Management70%

See all games like They Are Billions

A lesser-known kindred — Real-Time Strategy, Tower Defense, Resource Management, Base Building. 96% positive across 4,811 Steam reviews.

Both lean into Real-Time Strategy, Tower Defense, Resource Management, Base Building.

Real-Time Strategy90%Tower Defense85%Resource Management75%Base Building60%
Cliff Empire43% match

A lesser-known kindred — Post-Apocalyptic, Resource Management, Colony Sim, Isometric. 87% positive across 4,363 Steam reviews.

Both lean into Post-Apocalyptic, Resource Management, Single-Player, Colony Sim.

Post-Apocalyptic95%Resource Management88%Single-Player80%Colony Sim85%

A lesser-known kindred — Real-Time Strategy, Tower Defense, Tense, Resource Management. 87% positive across 4,686 Steam reviews.

Both lean into Real-Time Strategy, Tower Defense, Single-Player, Tense.

Real-Time Strategy85%Tower Defense90%Single-Player80%Tense70%
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