Kill bosses easily
  To kill bosses easily, trap them against a wall and attack them with your
  sword!

Easy way to get $999
  When you are low on money or hearts, if you have the shovel, just start
  digging in a lot of areas. This is an easy way to get $999, and maximum amount
  of hearts. This will not work in all areas, but it will work in most.

Start with a full complement of hearts
  You must have at least 30 jewels for this to work. When you've only got one
  heart left and you're near a save point, save the game, restart, and load it.
  You'll be where you were with a full complement of hearts.


Hints by Felipe Gerhard - felipe.gerhard@gmx.net