Zombies 4 - Weapon Merge is a strategic merge and defense game where your survival depends on how well you organize and upgrade your gear. Place weapons and armor on the grid and make them fit efficiently to maximize your loadout. Merge two identical items to upgrade them into stronger equipment that will help you survive the incoming zombie waves. Expand your grid to gain more space and collect additional weapons and armor for battle. Once the fight begins, your character stands their ground as waves of zombies approach—armed with your upgraded arsenal, automatically firing to eliminate the undead. Plan your merges carefully, strengthen your equipment, and complete all the stages as the zombie attacks become more challenging.