Zombie Heads is a very simple game in which you need to match identical heads in order to make them disappear from the board and score points. To match the heads, you just need to click on two identical heads and they will explode and disappear. The different heads will continuously fall in the trash can, and if any of the heads reaches the top, the game will be over. The objective of the game is to score as many points as possible.
As you advance in the game, new heads will fall, so it will become more difficult to make matches and they will start to fall faster. There are also several achievements and bonus points that you can get by making multiple successive matches. There is only one power-up available which is a bomb and it destroys all the heads, but you should save it for the moment you are just about to die because it costs you several points. Sadly, the game has only one mode and very poor graphics and sounds. The music is also very repetitive and annoying.
To sum up, Zombie Heads is just a very simple game to pass the time, which isn't very good, but at least is enjoyable and completely free.