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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.



Testimonials from Educators

Ever since KenKen Classroom was introduced, the program has been making the grade in schools worldwide, from pre-K through college. All kinds of students, including students with disabilities and those in the gifted programs, benefit from the fun, challenging math exercise. Here’s what some teachers had to say:

I think Ken Ken is the best thing that has ever happened to basic arithmetic learning, and I hope to see it eventually find its way onto the syllabus proper. Myles P., Teacher 

Thank you for these materials! I have a KenKen station in my 5th grade math classroom for all the students to enjoy! This is a great way for students to practice their basic facts and strengthen their logic skills! Thanks again and keep the puzzle coming! Robin C., Robert E. Bell School, Chappaqua, New York

I first saw KENKEN in the Boston Globe. By the time I'd finished the first puzzle I'd become completely smitten … itching to get hold of more puzzles. I couldn't wait to show the puzzle to the math teachers in the course I teach aspart of the Math for Teaching program I direct in Harvard's Extension School. As a math teacher I'm always thinking about what it takes to capture and keep people's attention in classes. KENKEN attracts people no matter what their math background. It's concise and elegant, and inspires people to use their mind in mathematically sophisticated ways they might not have thought possible! Andrew Engelward, PhD, Director, Math for Teaching, Harvard

"My classes spent part of the today creating their own KenKen® puzzles. The enthusiasm and results exceeded my expectations. Bill Lombard, Math Teacher and Blogger

Ten years from now, you will see KenKen puzzles in every elementary classroom in America. Harold Reiter, Dept of Math UNC-Charlotte

I teach math at a public elementary school in Somerville, Mass. The math consultant hired by the city to work with teachers on improving student performance introduced a group of us to KENKEN at a workshop. I have already noticed that some kids who normally hate math and/or do poorly in math are having a great time with KENKEN. I have a class of kids with learning disabilities who are proud of themselves for solving a 6x6 puzzle. Also, these students are very weak in basic computation, but they are learning in spite of themselves while doing KENKEN. I am so pleased that KENKEN forces the students to think logically and sequentially! Mike W. Somerville, Mass.

As the Math Coordinator for a local home schooling cooperative, I have found
Ken Ken a remarkable  tool for all abilities. The levels of logic provides a
wonderful learning experience for every student. Mark S.

I use it with a Smartboard in my classroom.  My middle school math students are totally hooked!Shep, New Roads School, Santa Monica California 

I discovered KENKEN on the NY Times. I am a Mathematics Staff Developer for the New York Public Schools and am always looking for innovative ways of having students practice basic arithmetic skills. I have urged the teachers I work with to use KENKEN in classes. Stuart F, Math Consultant

This is a completely addictive logic puzzle. In sudoku the numbers act only as symbols; in KenKen you actually use arithmetic. There are different sizes and levels of difficulty to the puzzles, so you can keep advancing and trying harder ones. The greater the difficulty, the more satisfaction you feel from finishing. Will Shortz, NY Times puzzle editor and Puzzle Master for NPR

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!

Subscribe to KKCR Emails (free)

Click here for more info

Follow the Leaderboard

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




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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