This is a great game because even on the lowest difficulty setting it is still a very challenging game. In order to survive you always have to have enough bullets, gas for your motorcycle and resources to craft bombs and melee weapons. There are a few things you can do other than story missions such as rescuing survivors or destroying nests. You not only have to take out humanoid enemies but animals or infected animals as well (usually wolves). The difficulty of enemies naturally increases as you improve your gear and progress through the story so if you don't do so well with enemies attacking you out of nowhere or weak with the horror genre in general, its best that you don't play this game.