If you're having trouble getting the HARD badge, try this:
Char: VAMPIRE HUNTER. Choose STR-boost Titles.
Stats: Until the 15th floor, for every level: Strength +3, Stamina +1.
Items: Have Shield and/or Heal equipped. The MOST important stats are Armor and Ice Resist, then Damage. No magic attacks. ALWAYS have back-up gear with ICE RESIST, so that when the BLUE CHARGING KNIGHTS start to appear, you can switch to them, even if that means sacrificing a bit of armor. Before dungeon level 10, your Ice should be at least 50%, and preferably 100%. Don’t waste time with stat bonuses.
After you've reached the 15th floor, you can get more creative with your stats. On the 32nd floor, my Vampire Hunter reached level 100 with the following: Str 312, Stm 117, Will 13, Int 20. I do 2000+ dmg, receive no ice damage, heal myself 300+ with each attach and and do 2-hit kills.
Enemies: Try focusing on luring one enemy at a time, especially if your armor/ice resist are low.
[+] if this helps! :))
Keys:
"1" - Cross
"2~7" - Colors
"Shift+Click" - Use Cross without having to manually toggle between cross/color
"Ctrl+Drag" - Move the board around in bigger puzzles
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