Concentration
(Published on 12. August 2026, 17:30 by ViKingPrime)
PUZZLE:
RULES:
Fill each separate 4x4 grid with the digits 1-4, so that there are no repeats within any row, column or box of that grid.
Each grid has exactly one solution "twin", a partner grid that will contain the same digits placed into the same relative positions.
Digits on a slow thermometer may not decrease starting from the bulb.
Digits along an arrow sum to the attached circle.
If a black dot sits between two digits, one is double the other. If a white dot sits between two digits, they are consecutive.
A square outside the grids is a skyscraper clue for the grids next to which it sits. A skyscraper counts the number of visible digits in one direction, wherein higher digits block sight of lower ones. The number seen in one direction for one grid is identical to the number seen in the opposite direction for the other grid.
Dedicated to all the twins in our lives, present and future.
Have fun!
Solution code: The top line of digits from the bottom line of boxes (Row 13, left-to-right, 16 digits total).
Comments
on 18. August 2026, 19:08 by Flinty
Big!
on 13. August 2026, 20:53 by GeorgeTheToad2
This was like Zetamaths Vignette
on 13. August 2026, 19:33 by mccuskp
One note about the solution checker for future solvers--if you attempt to put in the "correct" digits on the spots of the thermos that sit between two mini-grids, the solution check WILL say you have a digit incorrect somewhere. Leave those spaces blank if you want to use the solution check to confirm your progress or figure out where you went wrong if you think you made a mistake.
on 13. August 2026, 17:22 by damo_89
What a brilliant idea and execution. I dont think this is 3* difficulty, the deductions are all fair and relatively easy, the grid is just large.
on 13. August 2026, 13:13 by polcat
Brilliant! Thanks.
on 13. August 2026, 04:54 by Dermerlin
lovely puzzle
on 13. August 2026, 03:57 by Snookerfan
Great and original, loads of fun, thanks!
on 12. August 2026, 23:51 by ViKingPrime
Updated solution checker.
on 12. August 2026, 22:28 by marcmees
Where at first it seems the twins will be hard to spot between all the look alikes, one soon discovers the small differences. Fun solve. Thanks
on 12. August 2026, 22:12 by Ambrose
Absolutely lovely!
One tiny point, the solution check does not seem to know the skyscraper clue in c1.
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@Ambrose - Thank you so much for the heads up! should be fixed now <3 -- VKP
on 12. August 2026, 19:54 by Calvinball
Simply STUpendous!
on 12. August 2026, 18:31 by amirs
Cute puzzle!
on 12. August 2026, 17:53 by SennyK
Great puzzle, very enjoyable and relaxing solve! :-)
