Japanese Sums by JinHoo Ahn
or solve online (using our beta test of Penpa-Edit tools; use tab to shift between number entry and shading modes.)
Theme: High Five
Author/Opus: This is the 50th puzzle from our contributing puzzlemaster JinHoo Ahn.
Rules: Place the numbers in the indicated range (1-5) 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: 1 star
Time Standards (highlight to view): Grandmaster = 0:40, Master = 1:00, Expert = 2:00
Solution: PDF and solving video.
Note: Follow this link for other Japanese Sums puzzles.
This stumped me for a while because I was adding a rule that wasn’t there: I assumed all the numbers had to form a single connected group (they don’t).