Zombie Apocalypse Survive

Zombie apocalypse has began several month ago.
The only thing you know that in about year ago astronauts find strange virus in the Moon while was in Scientific expedition.
They took it to the Earth to explore .
But this has become a fatal mistake for all mankind.
You don't know how many people died, but you decide to kill as much walking dead as you can.
Fight against zombies in a lot of different locations. Since apocalypse has began you decided to destroy as much zombies as possible. You have only one gun at start, but in the shop you can buy powerful weapon.
Also you can try how long you can stay alive in additional bonus levels, each of them is available in the shop.
Good luck and have fun!)