Orcs Must Die is a wonderful single player tower defense game that I've put many, many hours into. If you like tower defense (which I absolutely love the genre,) I don't think you can go wrong on it.
Sadly, I feel like I can't speak about Dungeon Defenders even though I bought it for full price, since I got bored halfway through the second level and have never had the desire to go back to it. Then again, I don't have anyone to play it with, and I'm not going to play a co-op game with random people.
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