Looking for a certain zombie game?

I played it along time ago and now have forgotten what the game was. It takes place on a large map/grid, is a online type game, and is turn based. In the begining you can choose to be a firefighter, military person, police man, and docter I believe for certain benefits and items. In the game you can raid gun stores, warehouses, and barricade building so zombies don't eat you when you log off of the game. The game has a leveling system and a point system. Once you reach a certain level you can jump rooftops to other building so you dont have to go out side. Any help finding the game would be much appreciated.