Stupid Zombies is a physics game in which you have to kill all the zombies on the screen with a certain amount of bullets. It starts off very easy but after a few levels you need to plan out how to take the zombies out. Some of it is skill and there's a little luck to getting all three stars. Some of the early levels you can shoot the zombies directly but later on you have to blow up red cans or use similar type things to get the job done. The few the bullets you use the more stars you get, much like any other game in this genre. The graphic are ok but not great. However it clear that's the style the designer was going after. The game works fine and is pretty fun if you like this type of game. You get one free pass called an Air Strike if you can't pass a board and then you can buy more in the store. It's .99 for 5 Air Strikes all the way up to $3.99 for 100. I believe this is a paid app but it's been free for some time now. It's worth picking up and checking out.