 Set in the early 1990s, it pits players against one another as they invade others' houses and attempt to steal money from their vaults, while also setting up traps and other obstacles to keep their own vaults safe.In creating the game, Rohrer was influenced by his childhood fear of his house being robbed, numerous publicized shootings, and his own political views regarding gun rights and home invasions.During development and beta testing, the game went through several changes that increased its difficulty.