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Billion Citizens playtest
by Sucre Discret
Billion Citizens is a roguelike deck-building game with city-builder mechanics, where you play as a French megalomaniac mayor who dreams of designing the greatest and most populous megalopolis of all times. Manage your deck of buildings and place them wisely to maximize their synergies.
Anyone with a Steam account can join, and it's free.
- Access
- Instant
- On playtest since
- Oct 21, 2026
- Planned release
- To be announced
- Developer
- Sucre Discret
- Platforms
- Windows
- Players
- Single-player
- Languages
- English, French, German, Japanese and 8 more
How to join the Billion Citizens playtest
- Open the game's Steam page with the Join playtest button. Sign in to Steam if it asks.
- Use the Billion Citizens playtest signup there. You're in straight away, with nothing to pay.
- The playtest shows up in your Steam library, ready to install and play.
New to playtests? How Steam playtests work
How AI is used
Store page AI translation done in the following languages: Chinese (Simplified), Japanese, Korean, Thai, Russian, Spanish, German, Portugese (Brazilian), Turkish, Polish.
The developer's own words, from Steam.
About Billion Citizens
Billion Citizens is a roguelike deck-building game with city-builder mechanics, where you play as a French megalomaniac mayor who dreams of designing a megalopolis capable of housing 1 billion inhabitants.
Place your buildings, upgrade them, and combine them with your decrees to create powerful synergies.
Use the money generated by your buildings to customize your deck and manage your production to construct more and more structures.
You’ll need every possible optimization to reach the ultimate mandate, fend off political opponents, disasters, and an unhappy population to achieve victory.
A city builder with a rogue-like twist.
Combine, upgrade, explore, and build the largest cities using bonuses and Decrees.
Multiple terrains with new environments to experiment with endlessly.
As the Mayor, push the limits of your power: different starting conditions, unique Mayors, terrains, buildings, Decrees, and many hidden interactions to discover.
Take advantage of your versatile political arsenal to create overpowered combos, improve your deck, and grow your population.
- 40 unique decrees
- 6 terrains with different generation properties
- 9 Mayors with unique powers and starting conditions
- 50 different building tiles to create numerous combos
Dive into the wild and over-the-top world of Billion Citizens. Relax in this charming city builder offering thoughtful gameplay and a pleasant atmosphere.
After each run, discover new Mayors, terrains, and buildings.
Every game is different and offers a real challenge.
Enjoy the soothing and delicate visuals of large cities and regions inspired by France.
From the game's Steam page.
