Frequently Asked Questions:
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- What do the words "KENKEN" mean?
- Are there multiple solutions to each KENKEN puzzle?
- I think I found a mistake in a puzzle!
- How can I contact KENKEN Customer Service?
- Why do you have advertisements on this site? I came here to play puzzles, not look at ads!
- Do I get refund if I cancel my subscription?
- What is a “target number”?
- What is a "cage"?
- Can I repeat a number within a cage?
- Does it matter in what order I put numbers into a cage?
- If there is only one square in a cage, what do I do?
- Why are some lines dark and some lines lighter?
- Do I need math skills to solve KENKEN puzzles?
- How do I start solving a KENKEN puzzle?
- Can the puzzles be solved without guessing?
- I’m new at KENKEN and need some help. What do you have for me?
- I signed up KenKen Classroom Program and I don't receive any emails. Why?
- Where can I find instructions to play the online puzzles?
- Do you have mobile versions?
- I have narrowed down the possible numbers for a square. Is there any way to note this online?
- I don’t always like clicking on things! Can I enter or delete numbers and notes using my keyboard?
- What is with the purple and yellow squares?
- When I click on a square, what do the "X" and "eraser icon" mean in the number ring?
- Can I save a puzzle that I haven’t finished?
- How I can delete my account?
We have deployed a major update with many new features and options.
If the site isn't displaying properly, you may need to clear your browser. Thank you for your patience during this process.
* How to clear the cache: http://www.wikihow.com/Clear-Your-Browser's-Cache It may also be necessary to restart your computer.
Why aren't my puzzles loading? Here are a few things to try: Reload/refresh the web page. If that doesn’t work, make sure you have the latest version of Adobe Flash Player. Still not working? On your browser, empty the cache and clear the history. If all else fails, contact us and we’ll try to figure it out together.
My puzzles won’t print at all. What’s wrong? If you are using Firefox as your browser, click on "Print Problems" just below the PRINT button. [Note: I do not see this option on Firefox.] If you are not using Firefox, make sure you have the latest version of Adobe Flash Player. Still not working? Try printing from your browser’s file menu rather than clicking the printer icon below the grid. Or try switching to another browser. If all else fails, contact us and we’ll try to figure it out together.
If the above doesn’t resolve the issue, let us know which browser you’re using (and which version). Send us a screenshot of the issue. * How to send a screenshot
"Ken" is the Japanese word for “wisdom.” So we like to think of “KenKen” as “wisdom squared.” (See? We told you the puzzle makes you smarter—you just learned some Japanese!)
No! We create each KENKEN puzzle so that there is only one possible way to put the numbers in the squares. (As for no two snowflakes being alike, well, we’re still checking on that.)
First of all, that’s not a question, frequently asked or not. But we will answer it anyway! Our puzzles are created by a high-level artificial intelligence program called the Kenerator. For each puzzle, it verifies: that the numbers in each cage produce the intended target number; that no number is repeated in a row or column; and that there is only one overall solution (i.e. one possible way to place the numbers in the squares).
You see down at the bottom of the page, where it says “Contact Us” in smaller type? You can always click there. But right now, we’ll make it even easier: You can simply click here! We want to make your KENKEN experience as fun and clear as possible, so just let us know how we can help you!
We want anyone who enjoys KenKen to be able to play, regardless of financial situation. That’s why we offer free puzzles to you, and it allows us to support education through our free KenKen Classroom Program for teachers. The revenue from ads makes this possible. It also allows us to keep improving the site and develop great new features.
However, if you want a completely ad-free playing experience, just step up to our Premium Membership for just pennies a day!
You may cancel your KENKEN PREMIUM membership at any time. WE DO NOT PROVIDE REFUNDS OR CREDITS FOR ANY PARTIAL-MONTH MEMBERSHIP PERIODS OR UNUSED PORTIONS OF AN ANNUAL MEMBERSHIP. To cancel, visit our website and click on "Cancel Automatic Renewal" on the "Account" page.
The target number is the small number in the upper left corner of a heavily outlined group of boxes (called a “cage”). It is usually followed by a math operation (+, –, x, ÷). So, for example, the notation 6+ means that the numbers in the cage should add up to 6. The notation 48x would mean that multiplying the numbers in the cage should give you a product of 48.
That refers to one of the heavily outlined groups of squares in a grid. Every cage has a target number in the upper left corner. All cages (except single-square cages) have a math operation next to the target number. This is the operation that should be used when combining the numbers in the cage to produce the target number.
Yes, a number may be repeated within a cage as long as it is not repeated within the same row or column.
The order does not matter—just make sure not to repeat a number in a row or column. So, in a two-square cage, if the target number is 3 and the operation is subtraction, 1 and 4 can be placed in either order: The 1 on top or bottom in a vertical cage, or on the left or right in a horizontal cage. Now, as for putting on your socks and shoes, those have a specific order!
You should smile, because these are the easiest cages to solve. We call them “freebies.” The target number (in the upper left corner) is the number you write in the cage.
No, your eyes aren’t playing tricks on you. The dark lines outline a cage. The lighter lines separate squares within the same cage.
You don’t need to know the quadratic equation or be able to solve the Riemann hypothesis, but yes, basic math is involved. You’ll need addition, subtraction, multiplication, and division. You'll be able to pick which operation(s) you want in your puzzle.
Every KENKEN player has his or her own style. Many like to fill in single-square cages first. Cages that have only one possible set of numbers are good to look for. (For example, in a 4x4 grid, if there is a two-square cage with a target of 7+, we know the numbers will be 3 and 4.) For more tips, check our Beginners' Tutorial
We guess so! It’s true: With logic, basic math, and a little perseverance, any KENKEN puzzle can be solved. There is no guesswork required. This doesn’t mean that a little trial-and-error isn’t helpful. That can come in quite handy to eliminate possibilities in larger puzzles.
Watch our Videos page for two separate how-to lessons (one starring Will Shortz, New York Times crossword editor). We also have a step-by-step text tutorial You’ll be an expert in no time, and ready to move onto our next frequently-asked question!
If you have not received your email with the link to the KenKen Classroom (KKCR) puzzle set, it’s likely it got caught in a spam filter, or blocked by your computer’s firewall. If possible, check your spam/junk folder and check your firewall settings with filters adjusted to allow mail with KenKen in the subject line, and/or accept mail from kenken.com.
If there is no mail from us in the spam folder, we may have run into problems with your school's internal firewall blocking mails from us. Our KKCR weekly sets are sent via a mailing service called Constant Contact. Some domains find emails like this suspicious and block them. In this case, please contact your IT team to whitelist the following IP addresses associated with the Constant Contact server that we send KKCR mails from.
Please let us know if this resolves the issue. If you prefer we edit your account to send the mails to an alternative email address, please write us with the information to email@example.com.
All mail from KenKen is sent from:
IP Range: 188.8.131.52 - 184.108.40.206
Network/Netmask: 220.127.116.11 255.255.255.0
Specific IPs sending from this range:
You’ll find detailed instructions by clicking on "Tips to Play Online" on home page or simply clicking here.
There is a “Notes box” left side of the grid. Click on the possible numbers from that bar. The numbers will show up in small type in the square. For more details, see our online instructions. Want to repeat your note(s) in another square? You can simply drag the note from the first square to the second!.
Sure! Once you’ve selected a square, you can press shift and a number key to enter (or delete) that number as a note. Or, to just enter a number in a square, press that number on the keyboard (no shift). To delete a number, press C.
When you move your mouse over a square, it turns purple. When you click on a square, it turns yellow.
If you change your mind about a number you’ve answered, clicking the eraser icon will delete it. If you want to hide the number ring, click “X”.
Yes! As a KenKen general member, you may save one free puzzle. If you are a KenKen Premium level you can save up to 20 puzzles! You can start from here.
To cancel, click on "Account" and follow the simple cancellation instructions. No refunds or credits for partial months.
If your question is not answered, please contact firstname.lastname@example.org
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