They Are Billions

They Are Billions

Numantian Games · June 18, 2019 · Base Building, Colony Sim, Strategy, Zombies, Survival

Buy They Are Billions from Steam at $29.99 — the cheapest of 4 stores we compare.

PC
Very Positive85% · 51,41177Metacritic1,721playing now
Best price
$29.99
lowest tracked $4.14
Steam Buy at Steam

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Where to buy They Are Billions — official stores

Steam
Steam
Standard Edition · Steam
$29.99
Buy
Humble Store
Humble Store
Standard Edition · Steam
$29.99
Buy
GOG
GOG
Standard Edition · DRM-Free
$29.99
Buy

Cheapest They Are Billions keys — keyshops

Keyshops are third-party marketplaces — keys are resold and can be region-locked or a different edition. Check the listing's region & edition before buying.

CJS CD Keys
CJS CD Keys
Standard Edition · Steam
$38.42
Buy

They Are Billions price by region

They Are Billions costs £24.99 in the United Kingdom, $29.99 in the United States, €29.99 in Europe (EUR), $29.99 in Georgia (USD), CA$33.99 in Canada, NZ$36.99 in New Zealand, A$41.95 in Australia, R$58.99 in Brazil and zł107.99 in Poland right now.

Cheapest They Are Billions offer in each region, in local currency
RegionBest priceOfficial storeKey shopStores
United Kingdom £24.99 £24.99 £29.04 4
United Statesyour region $29.99 $29.99 $38.42 4
Europe (EUR) €29.99 €29.99 — 3
Georgia (USD) $29.99 $29.99 — 3
Canada CA$33.99 CA$33.99 — 3
New Zealand NZ$36.99 NZ$36.99 — 3
Australia A$41.95 A$41.95 — 3
Brazil R$58.99 R$58.99 — 3
Poland zł107.99 zł107.99 — 3

Each row is a real price from that region's own stores, not a currency conversion, so the figures are not directly comparable. Switch regions in the header to shop the one you buy in.

Trailers & screenshots

Watch the They Are Billions trailer →

About They Are Billions

✦ AI summary

Build and defend human colonies against billions of infected in this real-time strategy game set in a post-apocalyptic future. Manage resources, construct fortifications, command mercenary armies, and survive massive zombie swarms across a 48-mission campaign or endless procedurally-generated maps, all with the ability to pause and plan your every move.

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!

They Are Billions — game info

Platforms
Windows
Steam Deck
Playable
Player modes
Single-player
PC Game Pass
Not included

They Are Billions in the rankings

DLC & expansions

🎁 Complete the collection

Base game + 1 of 1 DLC at today's best prices.

$36.98
to own everything

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

Recommended Sep 7, 2026
if you like games like Age of Empires and zombie games, you should have already bought this game yesterday. it may not have the most realistic graphics, but it's such a fun game that i'm personally grateful for the simplistic graphics. it means i can install on pretty much any computer capable of connecting to the internet and it runs like a dream. i have over 2500 hours in this game and since i bought it i have been gradually working my way up the difficulty scale. at this point, i'm at about 13% difficulty in survival mode and still struggling. yes, there are easier difficulty levels which actually make this game pretty accessible across player skill ranges. but the customisation of difficulty means that you will likely have to keep trying to actually beat this game on harder levels. replay value is absolutely through the roof.
Recommended Sep 7, 2026
Very fun game for strategists. Currently ended my 2nd campaign playthrough on 800% difficulty. Sadly there is no official DLC. Only mods. I´m pretty sure if they released some DLC campaigns (like AoE2 does) people would come in billions
Recommended Sep 7, 2026
i love it Full stop.
Not recommended Sep 7, 2026
1 tiny mistake and you have to restart the whole run. Porgression and what you unlock is very impactful, reclaiming the map during the game feels freat and going up against this many zombies is quite unique. Can't recommend because of how much the game does not respect your time.
Not recommended Sep 6, 2026
I cannot recommend this game for two issues: 1. There is no custom hotkey option to set. What kind of lazy ass developer doesn't add custom hotkeys? The existing hotkeys bring you to a menu, but then there is no hotkey to actually build the the specific building. 2. there is no option to retreat / forfeit a game that is already halfway lost in the campaign. You just have to wait and sit for 3-5 minutes until you lose. 3. The cust scenes entering menu etc is slow and just adds lagg to the game. All of these are super easy to resolve.
Not recommended Sep 5, 2026
Game by itself is fun, but it keeps crashing and crashing...impossible to play. While developers wont patch it, i suggest to use "Green Steam".

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