GAS Regional Constraints
(Published on 23. December 2025, 22:43 by SennyK)
Today I am happy to present very easy GAS puzzle created for Scojo's prompt, this time to create a puzzle with regional constraints and tentropy lines :-)
I hope you will enjoy and I would be really grateful for all the comments and ratings.
Normal sudoku rules apply.
Regional constraints: Each constraint type may contain no repeated digits anywhere in the puzzle.
Tentropy: Every set of 4 adjacent digits on the hollow peach line must contain a digit from each of the X-pair (ten-pair) subsets of {1,9}, {2,8}, {3,7}, and {4,6}. A 5 may not appear on a tentropy line.
German whisper: Neighbouring digits along a green line have a difference of at least 5.
Arrow: Digits along an arrow sum to the number in the attached circle.
White kropki dots: Digits in cells joined by a white dot are consecutive. Not all dots are given.
Black 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.
X: Digits in cells joined by an X sum to 10. Not all Xs are given.
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, 28 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, (Not so) Little Killers
★★★☆☆: Cops & Robbers, Positive Symmetry, Doppelgänger Killer 1-25, Region Whisper Line
★★★★☆: Liars. Liars Everywhere.
Solution code: First (1st) row of the grid from left to right.
Comments
yesterday, 19:55 by sparkymanu
I love regional constraints puzzles and this one was great, thank you for submitting !
yesterday, 04:05 by damasosos92
Very cool puzzle!
yesterday, 02:03 by macintux
I certainly didn’t find it quick, but very smooth. I liked your use of the regional constraint.
yesterday, 00:41 by PinkNickels
Super fun!
on 23. December 2025, 23:26 by dzamie
Nice and quick. I'm not very used to Tentropy lines, but the wealth of other clues I'm familiar with made it basically a non-issue.
