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| On Calcudoku |
Early 2009, I read about KenKen (also known as Calcudoku) in the New York Times, and decided to write a program that creates similar puzzles, and put them online.
The rules are:
- the 4×4 puzzle uses the numbers 1-4, the 6×6 the numbers 1-6, and so on
- in each row and in each column each digit can appear only once (just like in Sudoku)
- each "cage" (the blocks with the thick border) shows a result and an operation (addition: +, subtraction: -, multiplication: ×, or division: :). The operation applied to the numbers in the cage should produce the result shown. Note that for subtraction and division the order is not fixed (!)
Look at the solutions of earlier days to make things clearer.
You can solve the puzzle on the page using the arrow and number keys, or using the mouse. Use the spacebar to clear a cell. Use backspace to undo a move. Press '=' to highlight the number in a cell. In the largest puzzles (10x10 Calcudoku puzzle (every Tuesday and Friday) and 12x12 (every Sunday and Thursday)), simply press 1 then 0, or 1 then 1, or 1 then 2 to enter 10, or 11, or 12.
You can now do the puzzles on Facebook (you can combine your facebook account with this one, and keep using both).You can also solve the puzzles on the iPhone/iPod Touch/iPad and the Kindle 3.
Every puzzle has a single solution.
And yes, solving Calcudoku puzzles will improve your IQ! :-)
"How to solve" video
20 May 2012 (solution tomorrow) Tomorrow's puzzles will appear in hour(s) and minute(s).
| Select size: | 4×4 | 5×5 | 6×6 | 8×8 | 9×9 | 12×12 |
| Select level: | Easy Medium Difficult | Easy Medium Difficult | Easy Medium Difficult | Medium Difficult | Difficult | Difficult |
Points: 3
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| Cell size: small medium large |
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This type of puzzle is known as Calcudoku, Newdoku, Rekendoku, MathDoku, Kashikoku-Naru, KenKen, Kendoku, Sumdoku, Calkuro, K-Doku, Keen, NekNek, CanCan, Square Wisdom, Emono, Minuplu, LatinCalc, Yukendo, ArithmeGrid, Hitoshii, and if you know of any other names, let me know :-). Of these names, "KenKen" and "KenDoku" are trademarks of Nextoy LLC. Note that this is a hobby site, and is not affiliated with Nextoy nor their brands. All puzzles published on this site are © Patrick Min.
Server time: Sunday 20 May 2012, 5:30:14 Central European Time.
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