Plague Inc. is one of the more popular games on the iOS App Store, and with good reason. Players gently guide and evolve a disease in an attempt to wipe out humanity, battling government research efforts. Increasing transmission, deadliness, and severity are all core to the success, but also ensuring that you have enough healthy hosts to thrive on. Different disease types enjoy different characteristics and offer new strategic options. It's a grim premise, but an entertaining one. If you've already been playing for awhile and are looking for ways to get more out of the game, check out some of our helpful Plague Inc. hints below!