I enjoy Desktop Tower Defense, but this is so much better, because of the variations in range, damage, rate of fire that you can set up for each tower, and also the combos. It is deceptively easy for the first few waves, well after 50 in fact, but if you let yourself be lulled, you'll be wiped out before the 100th wave, and if you last that long, things get much tougher after that.
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