They Are Billions is a strategy game developed by BlitWorks and available on PlayStation 4. The game is set in a distant future after a zombie apocalypse that destroyed almost all of human kind. Players must build and manage human colonies while struggling to survive under the threat of infection from billions of infected zombies.

There are two game modes available: Campaign and Survival. In Campaign mode, players must help the surviving humans to reconquer their country by completing dozens of missions with different goals such as building colonies, tactical missions, and rescue missions. In Survival mode, a random world is generated with its own events, weather, geography, and infected population. Players must build a successful colony that can survive for 100 days against swarms of infected zombies.

The game features real-time strategy gameplay with a pause mode that allows players to take their time to make strategic and tactical decisions. Players can build dwellings, acquire food, collect resources, and upgrade buildings to make them more efficient. They must also build walls, gates, towers, and structures to protect their colony from the infected. Players can train and contract mercenaries to protect their colonies and discover the unique skills and personalities of each unit. The game also boasts beautiful 4K graphics with a Steampunk and Victorian style.