20 April 2016

Modular Lightning

Title: Modular Lightning
Rating: 2/5

In the first of three puzzles of this type, modular arithmetic plays an important rule.  Here, all the sums are given mod 9.

The official rules:

  • The digits 1 through 9 appear in each row and each column exactly once.
  • Digits in each shaded region must add to the indicated sum (mod 9).   
  • Squares with multiple colors contain a number that’s used in the sum for adjacent regions of each of those colors.
  • Remember: numbers can repeat within a shaded region if that doesn't violate the first rule. 

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