Idle Zombie Defense is a free game available on Android that allows you to build and upgrade your own army to defend humans against zombies. With easy-to-play mechanics and a range of features, it provides an entertaining experience for players of all ages.

You can merge your soldiers to upgrade them and unlock new weapons, build your army camp for passive income, and choose different classes for your soldiers. There are lots of levels, environments, and boss fights to keep you engaged, and you can upgrade your hero or unlock new heroes to enhance your gameplay. For those seeking more challenge, Horde mode is available.