w00t
i love this game and for all u that are complaining about the hardness fo the game, just put a bunch of cheap $7 towers out and upgrade them until u can get the big ones. Then just make sure to put one big one per level and fill it in with the cheap ones. Then when the board is full, just turn cheap ones into big ones, then change every four big ones into a mega. the order of woods to buy is water, fire, earth. make sure to buy the woods in this order, water, fire, earth, and just alternate between them when u put down big ones. it is good to have a combination of both.