### Light by John Bulten

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(Note: puzzles during this bonus week are harder than usual; the four puzzles from Monday-Thursday are all about Thursday or Friday level difficulty.)

PDF

Theme: Maze

Author/Opus: This is the 44th puzzle from our contributing puzzlemaster John Bulten.

Rules: Shade some white cells black so that exactly one of the grid’s clues appears in each contiguous white or black region and indicates the clued region’s area. Circled numbers indicate cells that must remain white.

Also see this example:

Answer String: Enter the length in cells of each of the black segments from left to right for the marked rows. Separate each row’s entry from the next with a comma.

Time Standards (highlight to view): Grandmaster = 4:30, Master = 7:45, Expert = 15:30

Solution: Answers for this week in this PDF.

Note: Light is John Bulten’s variation of the shading puzzle Light and Shadow, created by Serkan Yürekli. Unlike Light and Shadow, where all numbered cells start white or black, in Light puzzles the numbered cells that are not shaded or circled may be either white or black in the solution.

• goz says:

Hello, can you at least tell me if the 12 is shaded or not ? I didn’t shade it and after completing 80% of the puzzle I met a situation where the 4 in the middle cannot be solved. Since doing all this I met interesting situations nonetheless I wouldn’t feel as a punishment to restart from there but I wonder if it really is that or if I made another mistake, thank you.

• JohnJBulten says:

I don’t recall! But it seems to me that (rot13) vs gjryir jrer oynpx gur pryy gb vgf evtug jbhyq or juvgr naq ab ahzore pbhyq ernpu vg, juvpu vf pbagenqvpgbel.

• goz says:

Indeed, I regret not having realised this myself.

So, do you have an idea of what I did wrong there ? https://i.imgur.com/1PzERCE.png

No matter how I connect the red area above the middle 4 to the 70 I end up having the 4 red that would be forced to connect the 70 area.

• JohnJBulten says:

I’ll confirm that nyy lbhe shyyl pbzcyrgrq ertvbaf ner pbeerpg. Fvzcyl erivrj nyy nffhzcgvbaf va vapbzcyrgr ertvbaf naq qrgrezvar jung nffhzcgvba(f) znl or hawhfgvsvrq.

Thank you for working on this! Happy Passover (chag sameach).

• Klotho says:

»Light and Shadow« appeared first in Puzzle Communication Nikoli, No. 34, June 1991 as »Shirokabe Kurokabe« by »shimon no kai« as an extension of Nurikabe. Later it was re-invented (?) by Inaba Naoki in 2001. Serkan Yürekli used it in 2006.

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