Why This Page?

There's a new Sudoku variant afoot, which introduces actual math into the puzzle. This variant is known by many names, including KenKen, MathDoku, KenDoKu, kenduko, cancan, square wisdom, minuplu, calcudoku, and latincalc. Perhaps the best-known of these names is "KenKen", due to an aggressive marketing push. That name, however, is trademarked; the majority of free puzzles can't use it to promote themselves, and are consequently hard to find. This page is an attempt to remedy that problem by listing the best web-based implementations of this puzzle, under whatever name.

The Short Version

To get started immediately: Start Playing

The Long Version

Here are the sites I've found so far, along with a capsule description of what each site offers. (This list represents the results of a search for only a few of this puzzle's many names; more sites will be added shortly.) For each site I list, in addition to its name and URL, the following information:

What kind of site is it?
Number of Puzzles
How many puzzles are on the site?
Puzzle Sizes
What puzzle sizes does the site offer?
Interactive Player
Does the site offer interactive versions of the puzzles?
Does the site provide solutions?
Does the site offer hints?
Puzzle Variants
Do the puzzles on the site use non-standard rules?
Site Description Number of Puzzles Puzzle Sizes Interactive Player Solutions Hints Puzzle Variants
NekNek Dedicated puzzle site Approx. 1200 3x3 to 9x9 Yes Yes Yes No
NYT Puzzles NYT daily puzzles (no archives) 6 (per day) Varies Yes Yes Yes No
Patrick Min Daily puzzles (w/ archives) 8-10 (per day) 4x4 to 12x12 Yes Delayed 1 day No Multicell division, subtraction; Modulo operator; Many others
Mathdoku Dedicated puzzle site "Thousands" 4x4, 6x6, and 8x8 Yes Yes Yes No-ops
Galeo Rhinus Dedicated puzzle site "Billions" 4x4 to 9x9 Yes Yes No Multiple solutions
DN's blog Dedicated blog Approx. 30 6x6 No Yes No Root, Power ops
Nextoy's Site Puzzle promoter's site 6 (per day?) 4x4 to 9x9 Yes Yes Yes No
Thomas Snyder Collection of blog posts Approx. 20 5x5 to 9x9 No Usually in comments No Many experimental variants
DJ Ape Daily(?) puzzles (w/ archives) 2 (per day) Varies No Delayed 1 day(?) No No-ops, Multicell division, subtraction
Minuplu Dedicated puzzle site Approx. 270 3x3 to 6x6 Yes Yes Yes No
Calcudoku Puzzle promoter's site 30 (per week?) 4x4 to 6x6 Yes Yes Yes No
Reader's Digest Monthly puzzles (w/ archives) 4 (per month) 4x4, 6x6 No Yes No No


Do you know of a site I should add? Is something out of date? Please write and let me know.

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KenKen is a registered trademark of Nextoy, LLC. This means that a puzzle can't be branded as a "KenKen" puzzle without the permission of Nextoy. (The idea is that, should this type of puzzle become as popular as Sudoku, the KenKen brand will have marketing value, and Nextoy can profit from licensing it.)

This site is not affiliated with Nextoy, LLC. or official KenKen-brand products in any way. It makes no representation as to whether or not the puzzles on any site (other than kenken.com) that it links to are official KenKen puzzles.