Boxhead more rooms

This is a fabulous little zombie killing game, as you kill more of the never ending waves of zombies, you unlock more weapons and upgrade the weapons you have. Every so often a red zombie -maybe a devil- comes out and harasses you which takes a little while to kill.

I love setting up big chains of explosive barrels and making the screen turn completely white with the explosion. Another thing I did often was to leave one zombie alive, which meant I had enough time to lay claymores at the entrances to the map. Try the different difficulty levels which make the game move faster and the different maps which add a little bit of variety. Highly recommended.