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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?
What players say
Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.
What reviewers agree on
64 of the 103 reviews raise this.
“Gameplay is perfectly fine if you're a fan of RTS and Tower Defence. Don't have any complaints on that side. However you should know this game is not casual whatsoever. If you die your game is over and done. Save wiped…”
“Fun game but lack of a proper save feature in a single player game that is punishing is just bad game design. It is not fun to slowly build up for an hour just to have you base destroyed over a single zombie slipping…”
“I’ve put 106 hours into this. The game design is insane, it’s beautiful, and the mechanics are deep and well-thought-out. Unfortunately, it is also incredibly frustrating. I can't beat the final level of the campaign…”
13 of the 103 reviews raise this.
“I normally dislike RTS games. They are over complicated with to much mechanics. However They Are Billions keeps it simple and easy to understand while having its own complications that doesnt overwhelm the player.…”
“This game is great if you like a challenge with your city builders, i like rts and city builders but they never scratch the itch on both sides for me this game does”
“This game is rough around the edges, but the challenge presented by its survival mode is incredibly fun, and something I have not seen done this well anywhere else. This game does also have a campaign, but I couldn't…”
10 of the 103 reviews raise this.
“seriously addicting defense game. loved it, will play again.”
“This game is amazing! I'm a casual RTS enjoyer, and this game is perfect for me, with the ability to pause the game at-will I don't have time pressure when balancing macro and micro like in most RTS games. The campaign…”
“Only game I have ever played that I enjoyed so much while being so terrible at it lol, I got some good hours on hours in story alone and will get more on survival too. Very replayable, my only complaint is that there…”
7 of the 103 reviews raise this.
“I’ve put 106 hours into this. The game design is insane, it’s beautiful, and the mechanics are deep and well-thought-out. Unfortunately, it is also incredibly frustrating. I can't beat the final level of the campaign…”
“Great story, art syle and gameplay. If you like Starcraft, Warhammer 40k and Red Alert, you'll love this game.”
“it can be very annoying and it's very difficult to spot any rouge zombies that manage to wander in but it's a beautiful game. one of the harder RTS games out there for that specific reason aswell as a single house being…”
4 of the 103 reviews raise this.
“fantastic RTS-with-pause game, lets you issue commands when paused so dont need quick response times. Its my favorite modern RTS skip the campaign, only play the survival game mode. its amazing and 100% satisfies my RTS…”
“Been playing this years, and continually keep coming back to it. RTS map defense at its finest. Top notch units, abilities, maps and controls. The only improvement could be in-game saves and better cut scenes. Really…”
“I love this game. It's really hard, I've only won one game so far out of many. The game controls, options, menus, animations, sound are all just about perfect. I'll give up on games like this that are too complex or…”
21 of the 103 reviews raise this · 12 of them still recommend the game.
“Gameplay is perfectly fine if you're a fan of RTS and Tower Defence. Don't have any complaints on that side. However you should know this game is not casual whatsoever. If you die your game is over and done. Save wiped…”
“Fun game but lack of a proper save feature in a single player game that is punishing is just bad game design. It is not fun to slowly build up for an hour just to have you base destroyed over a single zombie slipping…”
“I’ve put 106 hours into this. The game design is insane, it’s beautiful, and the mechanics are deep and well-thought-out. Unfortunately, it is also incredibly frustrating. I can't beat the final level of the campaign…”
17 of the 103 reviews raise this · 8 of them still recommend the game.
“Gameplay is perfectly fine if you're a fan of RTS and Tower Defence. Don't have any complaints on that side. However you should know this game is not casual whatsoever. If you die your game is over and done. Save wiped…”
“Fun game but lack of a proper save feature in a single player game that is punishing is just bad game design. It is not fun to slowly build up for an hour just to have you base destroyed over a single zombie slipping…”
“I’ve put 106 hours into this. The game design is insane, it’s beautiful, and the mechanics are deep and well-thought-out. Unfortunately, it is also incredibly frustrating. I can't beat the final level of the campaign…”
11 of the 103 reviews raise this · 4 of them still recommend the game.
“Fun game but lack of a proper save feature in a single player game that is punishing is just bad game design. It is not fun to slowly build up for an hour just to have you base destroyed over a single zombie slipping…”
“I’ve put 106 hours into this. The game design is insane, it’s beautiful, and the mechanics are deep and well-thought-out. Unfortunately, it is also incredibly frustrating. I can't beat the final level of the campaign…”
“Why hide a good game behind boring pixel hunter mini games. Let me play the fun colony builder and skip the silly 1hour+ time waster minigames of killing zombies one by one with one hero and then hunting for an…”
7 of the 103 reviews raise this · 1 of them still recommend the game.
“The Survival Mode is fun. The Campaign is not. I'd love to see the devs try their hands on a sequel that irons out the problems, but I can't recommend this game on its own merits. At least not without waiting for a sale.”
“Why hide a good game behind boring pixel hunter mini games. Let me play the fun colony builder and skip the silly 1hour+ time waster minigames of killing zombies one by one with one hero and then hunting for an…”
“This game "had" potential with its tech tree (if some technologies weren't mandatory like towers for waves of zombies) and building management. But it is ruined by the failure of the devteam to build correct and…”
5 of the 103 reviews raise this · 3 of them still recommend the game.
“I’ve put 106 hours into this. The game design is insane, it’s beautiful, and the mechanics are deep and well-thought-out. Unfortunately, it is also incredibly frustrating. I can't beat the final level of the campaign…”
“The games files can get corrupt at any time, only game that this ever happened. Cant save files anymore or even start again, tried to reinstall multiple times”
“Great game. It has pretty good campaign and very addictive survilal mode and custom modded maps. Definitely recommend if you like base building + tower defense games with micromanagement. Only bad things in game are…”
Counted across 103 English reviews, sampled to match this game's 85.1% positive rating · as of 2026-05-20
“As someone who thoroughly enjoys RTS games, I can confirm that this game is worth it every time. The controls aren't too bad, the gameplay loop is great and intense, the custom games are fun, the campaign (except hero missions) are enjoyable, and the difficulty range is perfect…”
— a player, Steam review · 420 hrs played“The first half of every game is a bit crunchier (resource management) than I would like, but the second half is always satisfying. Maybe even more so since your success depends on how well you set up your economy early in the game. It feels really good to see absurdly numerous…”
— a player, Steam review · 542 hrs played“super hard game, lots of fun and replayablity, wish it had a Coop Tho. 4 Stars because No Coop”
— a player, Steam review · 145 hrs playedPlayer activity
Monthly average concurrent players. Live count fetched 2026-07-24 00:30 UTC · history via SteamCharts.
Achievement stats
Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-07-25.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-07-24). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
They Are Billions now on Nintendo Switch 2
Hey everyone! We're thrilled to announce the release of They Are Billions for Nintendo Switch 2 , available now as of January 22nd! As a major highlight, it's one of the few games on this platform tha
Modding Game Rules
Hello everyone! We have been working for a while on improving and expanding the They Are Billions level editor. The first big update, available right now in the new version V1.1 , allows to modify the
Happy Holidays!
There is always time for a celebration amongst friends, even for those who keep us safe from the zombie apocalypse. Who would have thought that cooking was one of the Sniper's skills! Happy Holidays a
The New Empire Campaign available for XBOX One and PlayStation 4, and more!
Greetings! Great news! The Campaign mode of They Are Billions is finally available for consoles for free. To play it just let the game update automatically. It’s been almost six months of hard work. W
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-20.
| Genres | Strategy |
| Player tags | Base-Building · Colony Sim · Strategy · Zombies · Survival · RTS · Tower Defense · City Builder · Steampunk · Building · Post-apocalyptic · Singleplayer (SteamSpy community voting) |
| Features | Single-player · Steam Achievements · Steam Trading Cards · Steam Workshop · Steam Cloud · Stats · Steam Leaderboards · Includes level editor |
| Languages | English * , Spanish - Spain, French, German, Japanese, Korean, Polish, Portuguese - Brazil, Russian, Simplified Chinese, Traditional Chinese, Italian * |
| Achievements | 34 |
| Estimated owners | 2,000,000 – 5,000,000 (SteamSpy) |
| Official site | http://www.numantiangames.com/theyarebillions |
Minimum system requirements (PC)
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.