SWAT and Zombies

In game you are SWAT to kill zombies and monsters to save your city. Zombies and monsters will come close to kill you.They will attack you but you have gun to fight with them. You have M39 gun to kill zombies and monsters but you can get special gun to kill zombies and monsters in one shot.Collect more coin to buy new gun in store.How to play-Kill zombies and monsters-Collect more coin to buy new gun-Collect special weapon to kill zombies and monsters in one shot.