- Defender is a game of tactics, strategy and decision making. It is 
   comparable to various Tower Defence type games, but with key differences. 
   Each level consists of a number of waves. Each of these waves is 
   progressively harder and must be prevented from reaching the exit points. For 
   every monster killed your defenders are awarded gold and experience. Gold 
   can be used to purchase new defenders, level up existing defenders or pave 
   new areas ready for defenders to use.
 - Instructions and controls are in-game.