Grind coins to purchase the best sword you can have. Your best choices are the Pixelbrade (1,000 coins) or Multus Karate Chop (5,000 coins). Note: The strongest weapon costs 15,000 coins. There are different slicing techniques but they are based on the direction you do the slicing. You must learn to slice in four directions (vertical, horizontal, diagonal and reverse) but do so in variation.