Happy Mask 1
(Published on 4. January 2023, 14:47 by Alcar)
Happy Mask 1
Rules:
Normal Sudoku rules apply: Find the unique solution where each row, column and box has the digits 1 to 9. Adjacent digits along a red line must differ by at least 6. Cells with a grey square must contain only even digit. Digits in a killer cage must not repeat, and their sum must fulfill the condition given by the clue in the top left corner. Only three distinct digits exist on the blue line.
Puzzle:
Solution code: The digits in box 3 (top-right box) from left to right, and top to bottom, followed by the digits in box 5 (central box). No space between digits.
Comments
on 6. January 2023, 20:34 by SenatorGronk
Another option for that blue line would be to extended it to the bottom left corner and call it a region sum line. It would allow you to use an existing constraint rather than the less elegant "R4C6 is the same as either R3C7, R2C8, or R1C9".
Regardless, I enjoyed the puzzle, thanks!
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Alcar: Thank you for the feedback. As a region sum line is a much stronger constraint, I'll keep this blue line. I'm sure someone can do an interesting puzzle based on this kind of line (line with X distinct digits).
on 6. January 2023, 09:46 by Alcar
Based on the suggestion from FinnishGuy, I replaced the arrow by a blue line to avoid confusion. The change is only cosmetic.
on 5. January 2023, 11:19 by Alcar
I added a link for solving this puzzle on CtC.
