Tarnation is a clever real-time strategy game by Brad Merritt that bears some resemblance to a tower defense title. You control a garden with rows of seeds ready to sprout into flowers that will dash off and dispatch incoming bugs. The bugs are made of Tar, you see, and if they reach the stream in front of your flower bed, they start to gunk up the water. Merely defeating all the bugs is enough to pass, but real excellence comes by releasing only as many flowers as you need.