16 September 2015

Toral Rorschach

Title: Toral Rorschach
Rating: 3/5


Another sum puzzle, and another toral puzzle (the fourth, after Prorus, Circuitry, and Fundamentals).  The properties of a toral board are in the last rule below.

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. 
  • The board is a “toral board,” that is, cells at the end of one row are considered adjacent to those at the beginning of the same row; cells at the end of one column are considered adjacent to those at the beginning of the same column, and all corner cells are considered adjacent.

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