Brotherhood is a brutal retro-style shooter that feels like a love letter to classic Wolfenstein 3D, but with a fresh and modern presentation. The game drops you into a secret complex hidden deep in the Swiss mountains, where a sinister religious brotherhood experiments on human subjects in an attempt to create a new superhuman species. You play as one of those test subjects, but unlike the others, your body is immune to mutagens - turning what should have been poison into a source of overwhelming power.