Merge guns: Zombie Attack

Merge guns into better weapons and kill zombies! Waves of zombies are incoming, you need to defend yourself! Purchase a weapon and upgrade it by merging into another weapon of the same level. You start with a pistol and can end up with the most powerful weapon - RPG. There are whole 7 levels of weapon upgrades! But be careful with upgrading the weapon as some weapons deal small damage over the area or can hit only one zombie with a lot of damage! Complete each city that consists of 6 waves of zombies and defeat the unique bosses of every city!