Shape Defense is a challenging tower defense game that has three difficulty levels and multiple maps.

Place and upgrade towers so that they eliminate the enemies before they can escape. You earn money with each enemy that you eliminate. Each level is tougher but you also earn more money per enemy killed.

Shape Defense Cheat:
When you sell a grinder tower you receive twice as much gold as you have spent to build and upgrade it. I recorded the all-time high score when I used this exploit. I am sure that others can beat my score using this exploit if they have a faster computer and more patience.