Tuesday, 9 December 2008

countdown riddles

Have a look at my new countdown riddles site http://countdown-number.blogspot.com/

Saturday, 6 December 2008

new puzzle site

If you like kenken you might want to check these puzzles as well http://arithmeticjourney.blogspot.com/.

Sunday, 30 November 2008

Sunday, 9 November 2008

Sunday, 6 July 2008

Wednesday, 18 June 2008


Here is a new puzzle, apart from the four basic operations it also has the root and power as operations. Note that those only work with two numbers. As an example 9 can be 3 to the power 2, while is can also be the square root of 81.

Wednesday, 4 June 2008

new puzzle

after a long break, hope you enjoy this arithmetic puzzle.

Friday, 16 May 2008


I have been told by Nextoy that Kenken is protected and so I cannot call my puzzles like this anymore, any new names are welcome.

Tuesday, 13 May 2008

Monday, 28 April 2008

Monday, 21 April 2008

Saturday, 19 April 2008

puzzle 17

Thanks for waiting, here is the latest puzzle

Tuesday, 15 April 2008

Saturday, 12 April 2008

Thursday, 10 April 2008

Wednesday, 9 April 2008

Monday, 7 April 2008

Saturday, 5 April 2008

Thursday, 3 April 2008

puzzle 10: bigger size

This is a 7x7 puzzle, so obviously use numbers up to 7. Let me know if you find issues.

Tuesday, 1 April 2008

Monday, 31 March 2008


The visitor stats from this blog reveal that the UK and US are eager for more kenken, followed by Hong Kong.

puzzle 7

I tried to make this one a bit more difficult...

Book recommendations

Sunday, 30 March 2008

Thursday, 27 March 2008

puzzle 5

new puzzle

and solution

Wednesday, 26 March 2008

puzzle 4

Here is the fourth puzzle, hope you like it

And the solution

Tuesday, 25 March 2008


again about the rules, if you have a n by n grid, you need to fill in each row and column the numbers 1 to n, not repeating any, in each box you have a given result and maths operations, fill in the number which together with the operation give the result, you can repeat numbers in a box, but not in a row or column.


feel free to leave any comments and also vote if the puzzles are too easy or difficult.


... was created by Japanese mathematics teacher Tetsuya Miyamoto.

Monday, 24 March 2008

puzzle 2

Here is a bigger puzzle 6x6.

The puzzle

The solution

Saturday, 22 March 2008


This is a new blog about the japanese kenken puzzle, puzzles to follow soon ...