You are the mighty evil overlord and the good heroes have have to steal your gems off you to prove there loyal to the Good King. Don't let any of them touch your gems by using the power of Orcs, Undead and Demons as well as towers to defend and fight back. Make sure while building towers to place them on the correct ground type (Ice, Dirt or Grass) to ensure there maximum damage. Save high defense scores and try 15 exciting levels to see how much of a fight you can put up to keep your gems.