Merge Army VS. Zombies

The apocalypse has arrived, and a terrifying zombie virus is sweeping across the globe. Faced with the surging army of zombies, as a survivor, you need to use vaccines to save more animals and survivors, and form a team to resist the zombie army. In this apocalyptic catastrophe, the key to survival lies in constantly merging and upgrading your team, unlocking tanks, planes, and various weapons, making the team stronger and becoming the backbone of resisting disasters.

How do you, as a survivor, resist when the zombie virus sweeps across the globe?