The undead are hungry. Don't plan on being their next meal. Take them out with your weapons to stay alive. Upgrade your weapon and grenade capacity and power. When ammo power is fully upgraded a single bullet can penetrate two zombies at once. You will be ranked on accuracy; number of waves survived and kills.
When ammo power is fully upgraded, a single bullet can penetrate 2 zombies at once.
You can buy defensive barricades in the scroll box at the upgrade menu. These barricades will degrade to nothing if zombies destroy them. Some are stronger then others.
You will be ranked on accuracy,number of waves survived and kills, and ranked accordingly in the end