Without question, Day Z is one of the biggest games in the survival genre. Originally billed as a survival game in a world filled with zombies, it quickly became apparent that the biggest threat players would face would be each other. As you scavenge the large open world, you'll find yourself constantly looking over your shoulder. Since it's built on the ARMA 2 engine, you not only have to worry about getting attacked, but even if you survive, you could bleed out if you don't have the resources to stop the bleeding. Between the large world and the danger that fills it, Day Z is definitely a harrowing experience.