A lone survivor awakens in an underground bunker at the center of an inescapable maze, surrounded by natural predators and increasingly lethal mechanical adversaries determined to hunt him down. Armed only with whatever firearm he can locate among five random spawn points scattered across the labyrinth, he must navigate treacherous terrain while managing limited ammunition—just six bullets per weapon before being forced to venture defenseless toward the next cache. As his score climbs, more sophisticated robots emerge to pursue him through corridors and blind corners, each designed as potential kill zones, while a spider-infested web in the maze's far reaches presents both sanctuary and prison, slowing movement and weakening his weapon's effectiveness. Though he can retreat to his starting bunker for temporary safety, even this shelter offers no guarantee against the most advanced enemies that possess enough firepower to breach it.