The Fallout series takes place in a post-apocalyptic wasteland where much of Earth's residents were wiped out in a nuclear war. As such, the games are inherently dark. Skeletons litter the open-world, and many of the games' enemies consist of mutated humans or animals. However, the series is so fun to play and the developers add so much whimsical humor to the environment that many players forget just how bleak the world of Fallout can be.