Dr Gareth Moore, the author of over 20 best selling international puzzle and brain-training titles from a wide range of publishers, published a great Sudoku variant puzzle on his weblog.

Rules for this is a five-grid Samurai Killer Calcudoku:

– Place 1 to 9 into each row, column and 3×3 box of the five underlying 9×9 Sudoku grids

– Place numbers into the Calcudoku dashed-line cages to fulfil the results at the top-left of each cage. The given operator when applied between all of the numbers must give the stated result, e.g. the solution to ‘5+’ could be ‘2+1+2’. For subtraction and division start with the largest number, so for example ‘3-‘ could be ‘6-3’.

– Numbers can be repeated in Calcudoku cages, subject to the row, column and 3×3 box constraints.

Unlike his other puzzles he hasn’t used any symmetry in this one. This Sudoku variant isn’t especially hard, but with so many places to potentially go it might take you a little while. Happy Puzzling!

Tags: Sudoku | Math | Puzzle

hey there am really interested in doing this puzzle – however was looking at it – now if dividing the image by 21×21 small boxes in the 7th Row 2nd column – there is a “7 divide” – i am a little perplexed in how you would get the answer to that only using numbers 1 to 9! unless it is a “7 plus”. but have blown it up and is definitely a division sum – would love some clarification!

The best person to answer your question would be the person who made the puzzle. You can find him here. http://www.garethmoore.co.uk/2010/01/samurai-killer-calcudoku/

hey thanks for the reply

ha just realized 7 / 1 = 7 -goodness

You’re welcome