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What is a They Are Billions CD key?

It's a digital game code that allows you to download They Are Billions directly to your PC from the game's official platforms.

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Release date
June 18, 2019
Official website
Numantian Games
Numantian Games
Strategy Zombies Survival RTS Steampunk Base Building ... Colony Sim

About this game

Build humanity’s last bastion and fortify it against billions upon billions of the undead.

  • Take on a challenging campaign with 48 missions that will require quick thinking and strategic planning as you fortify your defenses against swarms of zombies.
  • Jump into the sandbox Survival Mode where each world is randomly generated at the start allowing for unique conditions for each playthrough.
  • All the action takes place in real-time, but if you need a second to think your way out of a pinch, you can use the tactical pause to calm down and give commands to your units.
  • It’s not just about defending against swarm attacks, you’ll also need to gather resources and build up your colony to make sure your population has what it needs to survive.


They Are Billions offers an almost perfect gameplay loop, mixing tower-defence with city building and exploration, as you balance resource-management, defence and offense, all against your ever-impending doom at the hands of a world infested with the undead.



They Are Billions is a game based on just a single trick that’s up its undead sleeve. But it’s a hell of a trick, one that’ll keep you ensnared in its tangled web of survival for dozens and dozens of hours as the undead march upon your best base-building efforts.

Critical Hit


They Are Billions is an interesting mashup of classic RTS, tower defense, and survival that successfully conjures up that “one more game” feel, assuming you can persevere through countless defeats.

Game Informer


  • OS: Windows 7 / 8 / 10 (64 bits)
  • CPU: Intel 2 cores 2Ghz, AMD 2 cores 2Ghz
  • RAM: 4 GB
  • HDD: 4 GB
  • GPU: Intel Intel HD3000
  • DirectX: 9.0c


  • OS: Windows 7 / 8 / 10 (64 bits)
  • CPU: Intel 4 cores 3Ghz, AMD 4 cores 3Ghz
  • RAM: 8 GB 
  • HDD: 4 GB
  • GPU: Radeon 7950, Nvidia GTX 670
  • DirectX: 9.0c

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There are 21 offers ranging from $22.43 to $43.89.

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GOG.COM CD KEY : You need to register on, then use the GOG Key to download and activate your game to play They Are Billions.
STEAM GIFT : A Steam gift is a one-time transfer you receive. You activate and install They Are Billions to play on Steam, it is a non-refundable game that stays in your Steam games collection. Please read the store description about any language or region restrictions.
STEAM CD KEY : Use the Steam Key Code on Steam Platform to download and play They Are Billions. You must login to your Steam Account or create one for free. Download the (Steam Client HERE). Then once you login, click Add a Game (located in the bottom Left corner) -> Activate a Product on Steam. There type in your CD Key and the game will be activated and added to your Steam account game library.
Early Access
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