24 September 2014

A Four Color Problem

Title: A Four Color Problem (original)
Rating: 4/5

On the last sum puzzle, I had no inspiration for the title.  This week's puzzle is the first sum puzzle I created.  The second was published in MAA Focus; so consider this a two-for-one week.

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.   
  • 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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