Try your best to survive from the randomly spawned Zombies that are going to walk toward you directly.

Tap on those Zombies to kill them, but don't tap too fast to avoid being paused.

Every time you tap on the screen the bar positioned at the bottom will increase, and when it is full, you will be paused from tapping till the bar calms down again.

When the Zombies collide with you, your health bar will start to decrease. If the health bar vanishes, you will lose the game.

You can use the fence-generator button to create left/right fences that will block the Zombies, and buy you some time.