Just a tip for some of the mid-level floors where chargers come in...MAKE THEM YOUR TOP PRIORITY. Kill chargers first so that if you try to run, you actually have a chance at surviving, because they have unlimited mana...IMO, the order of killing should be 1) Chargers 2) Healers 3) Fire breathers. Also, lure enemies out one at a time by slowly moving towards the room until one of them comes after you. Rinse and repeat. Slow process, but can easily get you the hard badge.
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