Hold out against the zombie boxes. Your gun aims itself.
Arenas
How to play
Put your thumb anywhere on the screen and drag to walk. Lift it to stop.
Your gun aims at the nearest zombie you can see and fires by itself. Keep moving and keep them in front of you.
Your score unlocks new weapons as you go: uzi, shotgun, barrels, grenades, barricades, then rockets. Tap one at the bottom right to switch.
Barrels and barricades are dropped, not fired: tap one and it lands on the dotted square next to you, behind you as you run (or towards the zombies when you stand still). Your gun keeps firing. Shoot a barrel when zombies reach it. Zombies have to smash through barricades.
Quick kills in a row build a combo that multiplies your score.
Red devils appear from wave 4 and throw fireballs. Crates bring health and ammo. Watch out: your own explosions hurt you too. Stay out of trouble for a few seconds and you slowly heal.