Having to use particular 'support' or zombies to destroy a town feel tedious since this requires you to change out what you've got on the hotkeys, and the requirements can even be mutually exclusive. Achievements shouldn't be for how you play, but how effectively you play.
"The game was designed to be hard and not easy to get score"... put the difficulty into the puzzles themselves. And also, listen to your game's players when they tell you something, CHARSTUDIO, and be open to consider that you made a design mistake.
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