Yessss! finally I beat the end level of
Defense Grid: The Awakening, a 3D tower defence game. I love those games and I've played a lot of them. Starting with very basic tower defence games written as Java Applets and ending with this really beautiful 3D version of the game. The concept is pretty easy: you've got enemies walking from point A to point B and you have to build weapon towers to kill them before they reach point B.

Defense Grid gave me a total of approx. 8hrs of pleasure so far. Most of the maps are not that hard and after a few trials, usually one is able to get the strategy working and finish them up. However, I was kind of stuck in the last level. After a few trials, I gave up and draw the map in OpenOffice, so I could lay out my strategy better and visualize the paths i want the enemies (aliens that is) to take.
Read on to see how to beat the final level of Defense Grid.