14 May 2014

Iron Throne

Title: Iron Throne
Rating: 4/5

Sum Post 4
The hardest puzzle yet posted (in my opinion--as ever, feel free to post thoughts about the difficulty rating in the comments), and one that belies a fascination with a certain fantasy world.  If you get too frustrated, calm down: you don't want to lose your head.

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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