At the start of each level, players must quickly locate powerful weapons like the shotgun and sniper rifle, crucial for fending off hordes of zombies. Once the eerie alarm sounds, grotesque, ferocious undead flood the area. A single mistake can lead to being swarmed, so precise marksmanship, agile movement, and calm judgment are essential for survival.​ Resident Evil, Purge Operation, zombie survival, shooter, 3D game, horror, undead, zombie apocalypse, survival game, gameplay, strategy, weapons, shotgun, sniper rifle, hospital, hardcore, action, free download, best zombie game