Impregnable III
- Kropki dots
- Arrows
- Region sum lines
The brief
Standard sudoku rules apply: each row, column, and 3x3 box must contain all the digits from 1 to 9.
Digits on arrows must sum to the digit in the attached circle.
The teal line is a region sum line: the sum of the digits on the line within each 3x3 region is the same.
White dots separate consecutive digits. Black dots separate digits in a 1:2 ratio. Not all possible dots are given.
The pair of green squares in box 7 is a clone of the two green squares in box 3. The pair of yellow squares in box 9 is a clone of the two yellow squares in box 1.