Glitch occurs that when you pause or click upgrade, the wave timer will advance (though you can't see it until the game resumes) UP TO the launching of the next wave. This can be exploited on Challenge mode by simply pausing, waiting for the wave timer to advance to the next wave (30 seconds? less? I didn't count), then quickly unpause and pause again. The next wave will all come out at once, and then freeze when you pause it. Repeat this until wave 30, the enemies will be very close to their original spawn points since they've mostly been frozen in place, and you'll get the badge. I don't support cheating. Keep this message alive. plz.
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