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Theme: Why was 6 Afraid of 7?
Author/Opus: This is the 10th puzzle from guest contributor Sam Cappleman-Lynes.
Rules: Place the numbers in the indicated range (1-8) in some of the cells so that no number is repeated in any row or column. Numbers on the outside of the grid indicate the sums of adjacent number groups in that row or column, in order. Each sum is separated by at least one unused cell. A ? can represent any sum of 1 or larger.
Difficulty: 4.5 stars
Time Standards (highlight to view): Grandmaster = 12:00, Master = 20:00, Expert = 40:00
Note: Follow this link for other Japanese Sums puzzles.