I did some searching here, and saw that someone was talking about starting a Tower Defense game thread about 18 months ago, but I didn't see where it had ever actually been started, so I started this one to have an on-going TD game thread on the Straight Dope.
I started playing Kingdom Rush
last week. First I bought it for my iPad for US$0.99, then I started playing it on my home machine for free. I even coughed up the US$5 for the bonus content online, and it's kinda cool to see Yoda or Darth Vader or Scorpion or ninjas appear as my reinforcements. I'm not an expert on Tower Defense games, but this one has been great fun for me, and I'm looking for others.
What TD games have you played that you particularly enjoyed? Which ones sucked, and why?
And is there a Quarry Defense game? Because I'm fully prepared to throw things down there!