It's What You Do in the Dark That Puts You in the Light
(Published on 4. November 2025, 17:15 by SennyK)
Puzzle has been featured on BremSter YouTube channel: link
I hope you will enjoy my thirteenth puzzle.
I would be really grateful for all the comments and ratings.
Normal sudoku rules apply.
No line can either branch or share cells with other lines.
Dynamic fog: The grid is partially shrouded in darkness. Entering correct digits may lighten the darkness somewhere in the grid. No guessing is required.
Arrow: Digits along an arrow sum to the number in the attached 2-cell pill read from left to right.
Kropki dots: Digits in cells joined by a black dot are in a 1:2 ratio (i.e., one digit will be double the other). Not all dots are given.
Killer: Digits in a cage may not repeat and sum to the total given.
German whisper: Neighbouring/adjacent digits along a green line have a difference of at least 5.
Numbered rooms: A clue outside the grid indicates the digit which has to be placed in the Nth cell in the corresponding direction, where N is the digit placed in the first cell in that direction.
X: Digits in cells joined by an X sum to 10. Not all Xs are given.
Renban: Digits along a purple line form a set of consecutive digits in any order.
Equal-sum line: Box borders divide a blue line into segments which have the same sum.
If you liked this puzzle, I recommend trying out my other puzzles: The Erica Series:★☆☆☆☆: 1, 2, 4, 5, 6, 12, 15, 17, 23, 26, 27
★★☆☆☆: 3, 7, 8, 10, 11, 13, 14, 16, 18, 20, 24, 25
★★★☆☆: 9, 19, 21, 22 Shading/Ying-Yang:
★★☆☆☆: Pretty Odd Shaded Area
★★★☆☆: (+5)-Yang, Negative 8 YY
★★★★★: Why-Why? Fog of War:
★☆☆☆☆: Erica 12, Erica 17
★★☆☆☆: It's What You Do in the Dark That Puts You in the Light, Find It All, What the Fog?, Erica 20
★★★☆☆: Broken Flashlight in the Dark Pencil Puzzle/Sudoku Hybrid:
★★☆☆☆: Masyu (Short) Sudoku
★★★☆☆: Tetromino Sudoku
Various Puzzles:
★☆☆☆☆: Blown Fuses in Electrical Installation, Let Me Introduce Myself, French Wrench
★★☆☆☆: Symmetrical Fan, Night Club, Important Hour on the Clock, What Was the Sum Again?, Disgroup Joints, 10-Arrows, Antiking Dutch Skyscrapers
★★★☆☆: Cops & Robbers, Positive Symmetry, Doppelgänger Killer 1-25
★★★★☆: Liars. Liars Everywhere.
Solution code: Fifth (5th) row of the grid from left to right.
Comments
on 25. December 2025, 22:05 by 91loves
I loved this, great logic! This is also the first time I've ever understood the clue outside the grid constraint, I'm proud of myself for finally understanding it hahah (even though it took my WAYY to long to get it :D)
on 6. December 2025, 04:30 by AlexRaetselt
What a marvel of combinatorics!
on 6. December 2025, 03:31 by Exigus
Great use of the fog of war. Thanks!
on 17. November 2025, 15:55 by ark29
Exceptional puzzle. There was a bit in the middle where I was stuck for a while but then realised the no line can share or branch rule. Thanks!
on 12. November 2025, 20:59 by YogiBear64
Fantastic puxxle. I loved the fact that you were keep in suspense all the way through. Fog not going away made the puzzle more intriging. Loved it.
on 10. November 2025, 14:37 by LeaVulpina
Great puzzle. And loved the poem at the end!
on 10. November 2025, 07:21 by KyleBaran
Felt linear, but in a good way
on 9. November 2025, 15:09 by StanleySudokunitz
Wonderful set of rules as always! I kept second guessing myself but you really just gotta make sure your pencil marks are tight and keep on truckin!
on 9. November 2025, 12:53 by JasperHermans
Very fun puzzle!
on 7. November 2025, 01:59 by jorgenunez
So many times I thought I did something wrong, but never gave up. Amazing puzzle. Thanks!
on 6. November 2025, 20:04 by dzamie
That flowed very well! I got stuck for a bit because I forgot that lines can't branch, but beyond that, it was a very smooth solve.
on 6. November 2025, 00:20 by Supalea
Loved it ♥️
on 5. November 2025, 16:57 by googuee
That's a very nice and neat puzzle. Thanks for sharing!
on 5. November 2025, 16:14 by VitP
poetry, now? and good poetry.
however, with poetry, you need not obey standard grammar, and rather can emphasize CADENCE.
eg. take "it's what you do in THE dark, unseen", and see what happens if you DELETE the capitalized word.
on 5. November 2025, 16:03 by Martina
A truly great fun puzzle and a lovely poem for a bonus. Thank you!
on 5. November 2025, 12:22 by Krisonium
Lovely
on 5. November 2025, 11:54 by Fra314
Lovely and super fun! May I recommend your puzzles to BremSter? Thanks!
SK: Thank you! I am not sure who you are reffering to, but sure, go ahead :-)
Right, sorry, he has a YouTube channel where he solves puzzles!
on 5. November 2025, 08:14 by wuc
A puzzle like 400m hurdles. Sprint jump over a tricky hurdle and sprint again. Nice ideas along. Great fun thx.
on 5. November 2025, 01:39 by fishsaltyak
This was SOOOOOOOO good!
on 4. November 2025, 19:46 by lsmooth
Best puzzle I've ever played! Thank you. I really enjoyed it alot.
on 4. November 2025, 18:40 by Myfyr MJ
Very nice puzzle.
