KKND is set in a twenty second century post nuclear war world where two races of humanoids struggle for the control of the Earth and what little is left of its resources. KKND Xtreme is essentially the same as the original KKND game except that it adds more missions. You play one of two races: either Survivors or Evolved. Each race has their own unique set of units with which to fight. The game revolves around constructing buildings, gathering oil and training and deploying combat units to accomplish a set goal.