They should really make some item rewards for beating the puzzle packs they come out with!
Puzzle Blade: You gain an extra 2 base damage and 3 hp upon leveling if you did not regenerate that level! Puzzling piercer: You pierce 100% physical and magical resistance. Every time you regenerate decrease the number by 5% every level up the % is increased by 20%
Note: If you do not regain mana or Hp from revealing a tile you are not regenerating.
We made an expansion and it is awesome. Really, you should check it out, especially if you're looking for some extra challenge.