Kill all zombies to beat each level. Protect your civilians and don't let the zombies get them otherwise they die and turned to zombies. If all civilians die you must restart the level. Be careful not to hurt your civilians with friendly fire.Collect cash and use it to purchase upgrades in the upgrade store.Use the arrow or the WASD keys to walk around each level.Use the mouse to aim and shoot.Pistol: Press :"1" key to activate. Stock weapon that inflicts moderate damage.Shotgun: press "2" key to activate, when available.Upgraded weapon with a good spread shot. Does more damage at close range. Purchase in the upgrade store to make it available.Machine Gun: press "3" key to activate, when available. Upgrade weapon with a gast rate of fire. Purchase in the upgrade store to make it available.Sniper Rifle: press"4" key to activate, when available.Upgraded weapon which allows you to hit several targets at straight line.Granade: press"5" key to activate, when available.Upgraded weapon that you throw to inflict a wide range of damage.Be careful as the grenade can also hurt you and your civilansvery easily.Select you weapon, when available, by pressing the appropriate number key.Gunrox Zombie Outbreak it's your online free game!Have fun!