Zombie Survival Colony Builder: They Are Billions [Game Overview] "THEY ARE BILLIONS" is a survival strategy game where players build a city using limited resources to survive against hordes of zombies. [Features] - Gameplay that blends strategy and survival. - Beautiful graphics and a detailed world. - Includes a strategy guide to support gameplay. Operation confirmed. Please check the condition of the product in the photos. Please note that we cannot accept returns, refunds, or exchanges. There are no smokers or pets. Please understand and agree that this is a used item before purchasing.