Bob the Killer
(Published on 14. June 2025, 04:33 by mellowrobinson)
This is a sequel to my second published puzzle, but this time with Killer lines instead of cages. Thanks to everyone on discord that tested this one. :)
- Normal Sudoku rules apply.
- Draw 9 orthogonally connected regions in the grid, each containing the digits 1-9.
- Region borders divide each line into exactly two segments. A line must not exit and re-enter a region. Black dots sit on region borders.
- Digits on a line do not repeat, and sum to the attached total, if given.
- On a black dot, one of the digits is double the other.
Solution code: Column 5, top to bottom, with a / between region borders
Comments
on 18. June 2025, 08:14 by AngusWBA
Gorgeous puzzle! Thanks
on 18. June 2025, 04:41 by femto113
Brilliant! Loved all the little bits of line logic in the region finding phase, then some solid sudoku to finish it out.
on 18. June 2025, 01:35 by AngusWBA
Gorgeous puzzle! Thanks
on 15. June 2025, 22:32 by cherryhaunt
The break in to place the first digit after (mostly) finishing region building was quiet challenging for me, but extremely rewarding! Very smooth after that. Fantastic puzzle!
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That first digit is a real doozy! Thank you for solving, cherryhaunt! ♥
-mellow
on 15. June 2025, 02:21 by Chaka
This is just top notch sudoku setting! <3
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Thanks, Chaka ♥ - mellow
on 14. June 2025, 17:17 by marcmees
Very nice. thanks
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Glad you enjoyed, thanks, marcmees!
-mellow
on 14. June 2025, 15:57 by QuintusScaevola
This is a spectacular puzzle. It is so good, I had to register an account just so I can leave a comment. The region drawing is quite challenging but approachable. The solving is smooth as butter in a pan. Brilliant!
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Thank you QuintusScaevola! I'm glad you enjoyed, and welcome to LMD! - mellow
on 14. June 2025, 08:18 by rameshsrivats
Absolutely brilliant puzzle. Quite tough. But a great narrow path to the solution. Very satisfying.
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Thank you rameshsrivats for solving and for the kind comment! :) I'm glad the solve path didn't have any workarounds.
-mellow
on 14. June 2025, 06:20 by SparkNights
Is it regarded as exiting and re-entering a region if, for example, r1c3 and r2c4 belong to the same region while r1c4 belong to another region
- hi SparkNights. Your example is valid and not considered exiting and reentering. You can think of it like a region sum line in an irregular grid.
Thanks
