Serious Sam: Siberian Mayhem is a stand-alone add-on for the dynamic first-person shooter Serious Sam 4, which will send the main character to Siberia. According to the plot, Sam is trying to catch up with the traitor General Brand, but he is always one step ahead. In five new levels you will visit the Arctic coasts, deserted forests, abandoned villages and an eerie ghost town. Along with new enemies and bosses, new types of weapons await you to kill them.