We’ve just improved our KenKen puzzle technology! FIND OUT MORE.

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.



The KenKen player you are now using has been recoded into state-of-the-art HTML5 language instead of Adobe Flash. Enjoy!


Your new experience should be faster, smoother, and more enjoyable than ever before. While you may notice some subtle differences, puzzle play should be exactly the same as always...just better! If you have questions or comments, please email us at info@kenken.com.


Take Home For Students

How To Run a KenKen Tournament

Tournament-trophy2A KenKen competition is a great way to show your students how fun math can be, and it can be conducted simply and easily. In as little as 10 minutes, you can run a “KenKen Quick Competition”, or you can generate even more excitement with a Multi-Round KenKen Tournament, complete with a Championship Round. We’ve created “how-to” instructions you can use in your classroom. Just click below to download the PDF.

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.



General questions & Concerns: customercare@kenken.com

KENKEN Classroom Program:


International inquiries:

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