A great tower defence game, similar to the FWG game, Revenge of the Stick.
You have 6 types of towers, use them to build a maze from the entrance to the exit.
Each tower can be upgraded 4 times. With each wave, the enemies become stronger; use the money you earn to upgrade your towers to balance things out.
In the game you will find a more detailed description of the rules of the game.
http://www.freeworldgroup.com/g/i/towers-trap.htm
