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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.


About KenKen's Creator, Tetsuya Miyamoto

About KenKen’s Creator, Tetsuya Miyamoto

Innovative math educator Tetsuya Miyamoto created KenKen so students could truly experience the joy of learning in his well-respected Miyamoto’s math classroom.

To ensure that the puzzles would be pleasing to his students he designed them with an eye toward aesthetics: Notice a certain amount of symmetry in many of the puzzles. Each grid contains enough clues to help you to solve the puzzle, but not so many as to make it easy. And, of course, every KENKEN puzzle has only one solution. His method is straightforward: Students spend 90 minutes every week solving puzzles on their own. They quickly learn that perseverance is a key to success!

Miyamoto isn’t selective about the students he teaches: all are welcome regardless of ability and admission is based solely on a first-come, first-served basis. But parents of Miyamoto’s students know he gets results. Fully 80% of the children who attend his weekly classes later gain admission to Japan’s most exclusive schools. And Miyamoto’s students routinely dominate Japan’s “Math Olympics," the country’s top mathematics competition for students ages 11 to 15.

Miyamoto is a much-in-demand lecturer, known for his credo, “The Art of Teaching Without Teaching.” He explains, “If you give children good educational materials, they will think, learn, and grow on their own. They work in the same way as babies who naturally learn to stand up and start walking without actually being taught.”

Join the KenKen Classroom Program (KKCR) for FREE!

KenKen Puzzle Sets are sent every Friday. A set consists of a variety of levels and sizes that are appropriate for all ages / grade levels. Any educator can join for FREE - just click the button below!

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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