It is the end of the world, and everything is utter confusion. The only thing clear in the midst of the warring zombies and robots that are also out to slaughter you is: you must survive at all costs. In order to do this, you must defend your home base by utilizing traps and turrets that surround it.You can also develop different skills over the course of the game. If you're feeling really experienced, or just really bold, you also have the option of switching to hard mode, for enhanced game play. No matter what, just demolish all who attack.