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Steam app 644930 · updated 10 Sep 2026, 16:56 UTC

They Are Billions

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?

History chartsJune 2026 to September 2026
Last 30 days−31.7Gain−1.51%% gain3,702Peak
They Are Billions Steam header artwork
Numantian GamesNumantian Games
1,621playing now
2,82124-hour peak
22,295all-time peak
2,065average, last 30 days

Game information

Updated 10 Sep 2026, 16:56 UTC
App ID
644930
Product type
Game
Developer
Numantian Games
Publisher
Numantian Games
Release date
18 Jun, 2019
Release status
Released
Early Access
Platforms
Windows
Genres
Strategy
Game modes
Single-player
Controller support
Declared DRM
Achievements
34
Steam Deck
Playable
Metacritic
77

Features & support

Steam features

Steam AchievementsSteam Trading CardsSteam WorkshopSteam CloudStatsSteam LeaderboardsIncludes level editorRemote Play on TabletFamily Sharing

Controllers & input

Accessibility

Popular tags

Base BuildingColony SimStrategyZombiesSurvivalRTSTower DefenseCity BuilderSteampunkBuildingPost-apocalypticSingleplayerResource ManagementReal-Time with PauseDifficultTacticalManagementIndieIsometricMultiplayer
About this gameFull description from Steam
They Are Billions is a strategy game in a distant future about building and managing human colonies after a zombie apocalypse destroyed almost all of human kind. Now there are only a few thousand humans left alive that must struggle to survive under the threat of the infection. Billions of infected roam around the world in massive swarms seeking the last living human colonies. Campaign: The New Empire - Available now! Lead the campaign under the orders of Quintus Crane, ruler of the New Empire, and reconquer the lands devastated by the infected. 48 missions with more than 60 hours of gameplay. Build fortified colonies to survive in infected territories Destroy the swarms of infected with the Imperial Army. Make your colonies evolve with more than 90 available technologies. Explore the ancient human fortresses with your Hero. Discover the story behind the apocalypse... how did the pandemic start? Survival Mode In this mode, a random world is generated with its own events, weather, geography, and infected population. You must build a successful colony that must survive for a specific period of time against the swarms of infected. It is a fast and ultra addictive game mode. We plan to release a challenge of the week where all players must play the same random map. The best scores will be published in a leaderboard. Real Time with Pause This is a real-time strategy game, but don’t get too nervous. You can pause the action to take the best strategic and tactical decisions. In Pause Mode, you can place structures to build, give orders to your army, or consult all of the game’s information. This game is all about strategy, not player performance or the player’s skill to memorize and quickly execute dozens of key commands. Pause the game and take all the time you need! Build your Colony Build dwellings and acquire food for the colonists. They will come to live and work for the colony. Collect resources from the environment using various building structures. Upgrade buildings to make them more efficient. Expand the energy distribution of the colony by placing Tesla Towers and build mills and power plants to feed the energy to your buildings. Build walls, gates, towers, and structures to watch the surroundings. Don’t let the infected take over the colony! Build an Army What kind of people would want to combat the infected? Only the maddest ones. Train and contract mercenaries to protect the colony. They demand their money and food, and you will have to listen to their awful comments, but these tormented heroes will be your best weapon to destroy the infected. Every unit is unique and has their own skills and personality – discover them! Thousands of Units on Screen Yes! They are billions! The world is full of infected creatures… they roam, smell, and listen. Every one of them has their own AI. Make noise and they will come – kill some of them to access an oil deposit and hundred of them will come to investigate. We have created our custom engine to handle hordes of thousands of the infected, up to 20,000 units in real time. Do you think your colony is safe? Wait for the swarms of thousands of infected that are roaming the world. Sometimes your colony is in their path! Prevent the Infection If just one of the infected breaks into a building, all the colonies and workers inside will become infected. The infected workers will then run rabid to infect more buildings. Infections must be eradicated from the beginning, otherwise, it will grow exponentially becoming impossible to contain. Beautiful 4K Graphics! Prepare to enjoy these ultra high definition graphics. Our artists have created tons of art pieces: Beautiful buildings with their own animations, thousands of frames of animation to get the smoothest movements and everything with a crazy Steampunk and Victorian style!
Content & age ratings2 regional ratings

Regional ratings

DEJUS12Drogas lícitas · Linguagem imprópria · Medo
IGRS18Rokok dan/atau rokok elektronik, minuman beralkohol, narkotika, psikotropika, dan/atau zat adiktif lainnya · Horor · Penggunaan bahasa
System requirementsMinimum and recommended hardware

Minimum

Minimum: OS *: Windows 7, 8, 10 (32 and 64 bits) Processor: INTEL, AMD 2 cores CPU at 2Ghz Memory: 4 GB RAM Graphics: Intel HD3000, Radeon, Nvidia card with shader model 3, 1GB video ram. DirectX: Version 9.0c Storage: 4 GB available space Additional Notes: Minimum resolution: 1360x768, recomended FULL HD 1920x1080.

Recommended

Recommended: OS *: Windows 7, 8, 10 (64 bits) Processor: INTEL. AMD 4 cores CPU at 3Ghz Memory: 8 GB RAM Graphics: Radeon 7950 or above, Nvidia GTX 670 or above. 4GB video ram. DirectX: Version 9.0c Storage: 4 GB available space Additional Notes: 4K Monitor (3840x2160)
Supported languages12 languages
LanguageFull audio
English
Spanish - Spain
French
German
Japanese
Korean
Polish
Portuguese - Brazil
Russian
Simplified Chinese
Traditional Chinese
Italian

A blank audio cell means full audio was not marked in the returned language list.

Screenshots & trailersScreenshots and trailers

Trailers

AchievementsTotal count and selected achievements

34 achievements in total.

Show selected achievements (may contain spoilers)
Infected Killer Level 1Achievement
Infected Killer Level 2Achievement
Infected Killer Level 3Achievement
Infected Killer Level 4Achievement
Infected Killer Level 5Achievement
Infected Killer Level 6Achievement
Infected Killer Level 7Achievement
Infected Killer Level 8Achievement
Infected Killer Level 9Achievement
Infected Killer Level 10Achievement

View all Steam achievements