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We would love to provide everyone an ad-free experience, but we do need to generate revenue to cover at least some of our overhead. We're trying to be as reasonable as possible, and it also allows us to continue to offer you an option to access KenKen puzzles for free. For those who prefer an Ad-Free playing experience, we have an option for just pennies-a-day and it can be canceled anytime. BONUS! KenKen Premium also allows you to Track Your Progress, Join The Leaderboard, Save Puzzles, and more. Please consider this option for the best experience.

In addition, we continue to offer -- pro bono -- our KenKen Classroom Program which provides free KenKen puzzles and lessons to over 1 million students weekly. Revenue we raise from advertisements and subscription sales allow us to keep the program going, plain and simple. So thank you for supporting these teachers and students by supporting us. We all appreciate it.

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Basic Instructions

KENKEN puzzles can be as challenging as you want them to be. But learning how to complete them is TOTALLY EASY. Just fill some numbers into a grid! OK, OK, there is slightly more to it than that. But you’ll conquer KENKEN in no time by just following these instructions.

  1. The numbers you can use in a puzzle depend on the size of the grid. If it’s a 3 x 3 grid, you’ll use the numbers 1–3. In a 4 x 4 grid, use numbers 1–4. In a 5 x 5 grid… well, you can probably figure it out from there.
  2. The heavily-outlined groups of squares in each grid are called “cages.” In the upper-left corner of each cage, there is a “target number” and a math operation (+, –, x, ÷).
  3. Fill in each square of a cage with a number. The numbers in a cage must combine—in any order, using only that cage’s math operation—to form that cage’s target number.
    Example: Your target number is 5, your operation is addition, you’re using the numbers 1–4, and the cage is made up of two squares. You could fill in 2 and 3 (because 2 + 3 = 5) or 1 and 4 (1 + 4 = 5). But which number goes in which square? Read the next instruction!
  4. Important: You may not repeat a number in any row or column. You can repeat a number within a cage, as long as those repeated numbers are not in the same row or column.
  5. There is only one solution to each KENKEN puzzle. As long as you follow the rules above, you’ll know you got it right!

The best way to learn KENKEN is with an actual puzzle. So click here and we’ll walk through a grid together, step-by-step. Or, try a sample puzzle.

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Welcome to KENKEN!

No matter what you're looking for — learning or fun — KenKen.com has it! Free online puzzles. Cool math games. Number games. (More addictive than Sudoku or Kakuro? You decide!) Educational games for kids. Visit our For Teachers section for math teacher resources, our free KenKen Classroom program, and a message from Tetsuya Miyamoto, the Japanese educator behind KenKen. Miyamoto, chess master David Levy, and the rest of Team KenKen have crafted these math puzzles into great games for learning and brain training. Need even more KenKen? Check out our Will Shortz Presents books. Try our mobile app on iPhone and iPad or our Kindle version. Play on the New York Times puzzle page and NCTM website. Regardless of why, how, or where you play, KenKen are the math puzzles that make you smarter!

Sincerely,
Team KenKen