ARK: Survival Evolved has been one of the most popular games on Steam since it's Early Access launch last year. But the developers eventually realised while crafting and dinosaurs and dragons were part of the appeal, one of the real big drawcards was the ability to have a virtual Hunger Games.
So they created Survival of the Fittest (SotF), a round-based total conversion with faster levelling, gathering, taming, evolution events and tournaments. And guess what? The mode has proved so popular, the developers have now spun it off into it's own free-to-play game.