I love a challenge, but this game quickly gets to "impossible". I guess I dont need quotations, because it is actually impossible. Good graphics. Poor gameplay. It takes far too many steps to place a tower. The cost of upgrades is so ridiculous, you actually would have to play an entire round through to the end to afford a single tower upgrade. Im a huge tower defense fan, and got this based on a good review. I regret it FULLY. Good for the developers that have stolen this money from me. I guess this is a "good" business model in 2015.