How to solve a 9x9 KenKen puzzle without operation signs

Bored with crosswords and sudoku puzzles? Well, try your hands at a new type of puzzle: KenKen logic puzzles.

Invented by Japanese math teacher Tetsuya Miyamoto, KENKEN allows you to test your puzzle acumen and improve your math skills at the same time. KEN-KEN (kenken), KenDoku or Mathdoku is a style of arithmetic and logical puzzles sharing several characteristics with sudoku.

Watch this video tutorial series to learn how to solve a 9x9 KenKen puzzle without operation signs. The video from Math Mojo will also teach you the rules of KenKen, and then they walk you through solving the 9x9 Ken-Ken puzzle. This puzzle isn't for newbies; a 9x9 is fairly advanced, but you'll see exactly how to complete in this video series. Learn more.

**These videos are for very advanced KenKen. If you are just beginning, take a look at them to show you you can learn to get to an advanced level. But don’t get discouraged if you don’t understand what is going on! Remember, this is the advanced level.