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Why are there ads?

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.




Adding Smarts, Subtracting Fear, Multiplying Fun!

Our puzzles puzzle some: They can’t believe that KenKen—something so delightfully addictive, so completely fun—has an educational pedigree. But it’s true. KenKen was born in a Japanese classroom in 2004 and now boasts a proven track record of academic benefits—from increasing math skills and logical thinking to developing concentration, perseverance, and stamina.

It boils down to subtle shifts in challenge level, and a seemingly endless combination of numbers and operations. The more you play, the better you get. No wonder kids love it! And teachers do too: In fact, thousands of teachers worldwide now use our KenKen Classroom program, which allows them to target individual student needs with specially selected puzzles and chart student progress. Teachers who sign up for the free program quickly see why we named the puzzle after the Japanese word “ken,” meaning “wisdom.” (Loosely translated, KenKen means “wisdom squared.”)

A Great Family Activity...!!!
Teach Parents How to KENKEN!

Take_homeKenKen puzzles are great for everyone... parents, siblings, grandparents, uncles and aunts! We've created "how-to" instructions you can send home with your students so they can help teach their family and friends. Just click below to download the PDF.

Follow the Leaderboard

Join the leaderboard by subscribing with us! Solve puzzles without using any hints.



General questions & Concerns: customercare@kenken.com

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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!

Team KenKen