Friday, 6 January 2012

Puzzle #84: Scattered Sudoku with Added Clues

This weekend there will be Richard Stolk's Shapes and Sizes test on Logic Masters India. This is one of the puzzle types that will feature in the test.
The twin sums concept I first encountered on a Dutch Sudoku Championship. I really enjoyed that puzzle then. I hadn't come across any since reading the instruction booklet. The original puzzle employed standard Sudoku grids. I think using different jigsaw grids is actually an improvement. It removes the ambiguity of which grid will hold which solution. So I figured I'd try my hand at designing one. I think the result turned out pretty well. I think the puzzle is pretty tricky and am thus not sure how it relates to the difficulty of the test. It will still be some good last minute practise before the test, if people want it. Otherwise just enjoy it on your spare time.

Rules for Sudoku

Place the digits from 1 to 7 in every row, every column, every boldly marked area and the grey cells of both empty grids. The numbers in the top grid indicates the sums of the digits in that position in both grids.

Click to enlarge


  1. First solver to post!

    Took me a couple days, so here's a push in the right direction: the first break-in is how the 3 affects the right grid, but then I found I made more progress in the left grid. Still, the interactions are good.

  2. That's the right opening, yeah. Although it's looking at it in reverse as how I put it in.

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