Zombie Idle Defense 3D is a very interesting idle game. I'm guessing you'll love it and spend time with it. The gameplay is simple, just tap the machine and fire bullets to hit the zombies in front. Come and give it a try！ zombie game,idle game,defense game,arcade game,zombie defense,idle survival,tap to play,mobile game,strategy game,empire building,zombies,simulation game,skill game,brain training,resource management,upgrade,defense,shoot,idle