22 April 2015

Contour Map

Title: Contour Map
Rating: 2/5

This product puzzle reminded me of what are called level sets in a multivariable Calculus class.  If you haven't taken such a course, you might think of the regions as those in a topography map.

The official rules:

  • The digits 1 through 9 appear in each row and each column exactly once.
  • Digits in each shaded region must multiply to the indicated product.   
  • Squares with multiple colors contain a number that’s used in the product 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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