Fold Wars is Tower Defense in its purest form. It challenges your ability to think logically in time and space. You place towers on an open map to save your gold stolen by enemy. You carve the path the enemy takes. Depending on the enemy strengths and weaknesses you plan your strategy to place right type of towers at right place and right time. The score takes into account all aspects of your strategy and rewards you for the most efficient plan. There are many difficulty levels to choose from, so you don't get stuck.

http://armorgames.com/play/18384/fold-wars