Japanese Sums #3: Reef
(Published on 17. May 2023, 21:10 by Myxo)
The third entry in this series of Japanese Sums puzzles explores the well-known coral ruleset. Enjoy!
Rules:
Shade some cells of the grid and fill all unshaded cells with digits from 1-9, such that no digit repeats in any row or column.
Clues outside the grid indicate the sums of contiguous segments of unshaded cells in that row or column. There must be at least one shaded cell seperating two segments. All such sums are given and in the correct order.
?s stand for any digit 0-9, but double digit numbers may not start with a zero.
The shaded cells form a coral: The shaded cells form a single orthogonally connected region, and all unshaded cells are orthogonally connected to the edge of the grid. There cannot be a 2x2 of shaded cells.
Solution code: row 2 and column 10, S for shaded cells
Comments
on 25. November 2023, 10:48 by ibag
... die ...
on 2. October 2023, 16:58 by Christounet
I literally stared at this puzzle for looong minutes after shading 4 cells, trying to understand how to make any progress, until I realized that the coral was made of shaded cells, not unshaded cells ! Great puzzle after that !! Thanks :)
on 12. June 2023, 22:17 by lerroyy
Very nice puzzle and smooth solve!
on 22. May 2023, 14:14 by Niverio
Very cool! Loved the break-in and the solve path that followed.
on 21. May 2023, 13:18 by abed hawila
Very nice!
on 19. May 2023, 19:24 by Snookerfan
Very nice and tricky! Loved the ending, quite amazing. Thank you
on 19. May 2023, 16:34 by Xendari
Super fun, thanks!
on 19. May 2023, 06:59 by Agent
Very nice! Some really neat deductions.
on 18. May 2023, 22:31 by Piatato
Fun one! I got some great flow going, and enjoyed it a lot! :)
on 18. May 2023, 20:22 by Playmaker6174
Quite plenty of head-scratching deductions in this one, the solve felt consistent but very fascinating throughout till the end :)
on 18. May 2023, 19:02 by marcmees
some nice deductions in there. thanks.
on 17. May 2023, 22:12 by KNT
Impressive how it all resolves in the end, very tricky throughout
