Cross the Sums
(Published on 13. March 2023, 12:56 by abed hawila)
Puzzle rules:
1. Normal sudoku rules apply.
2. Japanese Sum: shade some cells so that the outside clues indicate the sums of the contiguous shaded cells in that row or column. A number indicates the sum of a complete contiguous block. A question mark (?) indicates that a contiguous block sum to a single-digit number and a double question mark (??) indicates that a contiguous block sums to a double-digit number. An asterisk implies that any number of blocks may exist, including zero. The clues are provided in the correct order (left-to-right, or top-to-bottom), and there is at least one unshaded cell between each pair of clued blocks.
3. Cross the Streams: the shaded cells form a single orthogonally connected group. No 2×2 area within the grid can be totally shaded.
You can play the puzzle online using the following link: Penpa+
You can check the following 6x6 example to visualize how the rules work. Also, you can give it a try here
Hope you have fun!
Solution code: Row 7 (9 digits from left to right) followed by the length in cells of each of the shaded segments from top to bottom for column 3. (for example: in the 6x6 puzzle, the length of shaded segments in column 4 is: 211)
Comments
on 19. July 2024, 23:35 by StephenR
Another little gem, thanks.
on 22. March 2024, 17:33 by Christounet
Very nice ! The second part of the puzzle was much harder for me.
on 28. April 2023, 06:04 by panthchesh
Beautiful puzzle. But what's the picture supposed to be?
on 31. March 2023, 15:27 by Krokant
Lovely puzzle. :)
on 21. March 2023, 11:37 by Mr.Menace
Lovely puzzle with smooth but intricate logic! Thanks a lot Abed!
on 14. March 2023, 04:21 by Xendari
Very nice! Fun throughout, very interesting shading logic
on 14. March 2023, 00:33 by Piatato
Very nice and rewarding puzzle! The shading interacts with everything so well!
on 13. March 2023, 22:36 by Jesper
Very nice, abed! I like how much CtS logic you actually managed to fit into the puzzle.
on 13. March 2023, 15:56 by Playmaker6174
A really gorgeous and satisfying puzzle! It’s interesting how the connection of shaded cells can lead to lots of interesting and cool logic :)
[also the 2 stars combo in a column was quite funny there x)]
