Man... The king of hell is a royal friggin pain. Not only does he start out with over 3mil HP, he heals himself too! This is going to take an entire week to kill him. :-\
god, this game is slow & boring! endless, extremely slow yammering that you can't skip through, just have to sit around playing with yourself waiting for them to stfu & let you actually click something, then sit around playing with yourself for another 10mins while they yakk again. I seriously wish this site allowed us to give games a negative star rating, 1 star just isn't low enough.
The blocks need to reposition themselves faster after you click. In the later levels, by the time you can click more blocks, 3 new lines have popped up. This makes it technically impossible to keep up.
Fun game, but has definite room for improvement. The towers are far too large relative to the map, which is worsened by all the places on the map that you can't build at all. The attackers are too weak, and there are too few waves per level. It really oughta be set up so that completing one of the campaign maps (ie not a sandbox one) will then take you to the next one, instead of having to start from scratch. Most of the towers really aren't any use at all. Just build about 3 SAM turrets & fill the rest with cannons & you've got an easy victory (the only time I ever lost even a single life point was when I tried to use some of the slow towers & splash towers).