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This will help you get the Flurry achievement for Defense Grid. By the end of the video, I slowly upgraded all towers to red(why show five more minutes of waiting for the end?) This should easily get you a gold medal and the achievement, this run gave me 170k points and all you need is 100k(and don't lose a core)... so precision isn't a requirement. However in order to get interest you should still only buy upgrades and towers when they aren't overkill. Note the playback is in Fast mode.