Cataclysm "Great Smog"-a chemical reaction between nuclear radiation and mysterious atmospheric pollutants that caused the world to collapse. 99.9 percent of the lives are mutated into zombies and you are 0.1 percent surviving. Build camps, save survivors, fight back. Aim for the head! Targeting the head shot precision shooting is the key! Headshots cause huge damage bonus, continuous headshots trigger even kill -- DOUBLE KILL, TRIPLE KILL, QUADRA KILL, PENTA KILL, and the ultimate LEGEND combo! Each weapon has a unique headshot mechanism that rewards precise operation! Four exciting game modes search-explore dangerous areas, collect resources, rescue trapped survivors arcade-unlimited wave survival, global ranking and season ranking levels -3 difficulty levels, 30 campaign tasks, Samsung rating system raid-challenge powerful Boss, obtain rare rewards 80 collectable survivors from ordinary to supreme 7 rarity levels, recruit and nurture 80 unique survivors. Recruits, veterans, heroes, masters, legends -5 levels of promotion system! Each survivor's unique skills strengthen the entire team! 4 weapon types-pistols, shotguns, rifles, sniper guns-each with unique rates of fire, penetration and headshot mechanisms. Bullets penetrate multiple enemies and experience a quick kill! Construction and management of camps Construction of farms, wells, warehouses and defense facilities. The camp produces food, water, wood and fuel around the clock. 100 + level building upgrades for maximum efficiency! Dispatch Mission sends survivors to automatic resource collection missions with 7 difficulty levels. High risk = high reward-but beware of infection! Survivors of infection were cured with serum. Fully upgraded armor, magazines, sights, grips, explosives and more than 15 kinds of permanent upgrades. Invest parts to enhance combat effectiveness and dominate the battlefield! Daily Quest and Season Pass Complete 10 quests per day, challenge 26 permanent achievements, and win limited rewards in the season arcade rankings! Doomsday can't win you over. Load the bomb, aim for the head, and take back the world!