It was a few months back that Atom Zombie Smasher caught our attention with its three player co-op tower defense like gameplay.  Players take control of a section of a city and use various methods to rescue as many citizens as they can.  While we enjoyed the title it did have two downsides in our opinion - 

There's a new zombie game out now on PC, Mac and Linux - but its unlike any other zombie game on the market.  Atom Zombie Smasher is a new strategy game from developer Blendo Games, makers of Flotilla.  Atom Zombie Smasher is a strategy game that gives players an overview of a section of a city overrun by zombies. Players must select an evacuation zone and then protect it from zombies as they try to rescue a certain number of civilians per map.