It's a Six out of Seven [CC]
(Published on 16. August 2026, 19:00 by SennyK)
Today I am very happy to share with you a puzzle created for Scojo's prompt with Chaos Construction and Lots.
My inspiration for this puzzle was Edgy by ThePedallingPianist, I recommend you give it a go! :-)
I hope you will enjoy and I would be really grateful for all the comments and ratings.
Chaos Construction: Divide the grid into seven orthogonally connected seven-cell regions. Place the digits 1-7 exactly once in each row, column, and region.
Perimeter Clues: A digit in a square indicates the number of Perimeter Cells (lying on the outer ring of the grid) in its region. Each region contains a different number of Perimeter Cells.
Interior Clues: A digit in a circle indicates the number of Interior Cells (NOT lying on the outer ring of the grid) in its region. Each region contains a different number of Interior Cells.
Cave Clues: A digit in a diamond counts how many cells of its own region it "sees" in the row and column combined, including itself. Region borders block vision.
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, 31, 32, 46, 47
★★☆☆☆: 3, 7, 8, 10, 11, 13, 14, 16, 18, 20, 24, 25, 29, 30, 34, 35, 38, 40, 42, 45
★★★☆☆: 9, 19, 21, 22, 28, 33, 37, 38, 41, 44, 45, 48
★★★★☆: 36, 39, 43, 50
★★★★★: 49 German Sums Series:
★★☆☆☆: 1, 3
★★★☆☆: 2, 4, 5, 6 Shading/Yin-Yang:
★★☆☆☆: Pretty Odd Shaded Area
★★★☆☆: (+5)-Yang, Negative 8 YY
★★★★☆: Aim High! (YY)
★★★★★: Why-Why?, Happ(Y) Birthda(Y), ChinStrap!, Growing YY in the Fog Puzzle Pack Chaos Construction:
★★★☆☆: Christmas Chaos, German Sums 6
★★★★★: Heyawake Sudoku, Top Right Boi, Erica 49 Modifiers:
★☆☆☆☆: Borrower
★★★☆☆: Modified Flat Mates, Neighbourhood Watch
★★★★★: Mad Delirium Puzzle: Remarkably Beyond Crazy [16x16], Top Right Boi [CC], There's Strength in Numbers 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, Erica 29
★★★☆☆: Broken Flashlight in the Dark Pencil Puzzle/Sudoku Hybrid:
★★☆☆☆: Masyu (Short) Sudoku, Heyawake Sudoku (Given Regions), Way Too Hot, Are You? [Hotaru Beam], Hey, What's Up? [Heyawake]
★★★☆☆: Tetromino Sudoku
★★★★☆: Made in the Shade (Heyawake CC)
★★★★★: Heyawake Sudoku Pairometers:
★★☆☆☆: Pairometers (6x6 Pack 1), Pairometers
★★★☆☆: Pairometers (6x6 Pack 2), Pairometers (6x6 Pack 3) Various Puzzles:
★☆☆☆☆: Blown Fuses in Electrical Installation, Let Me Introduce Myself, French Wrench, GAS Regional Constraints, Quadsumes, Snack Latin Arrows, Sarah
★★☆☆☆: 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, Indexing Sword, Larna's HoneyMoon, Ascending Sums
★★★☆☆: Cops & Robbers, Positive Symmetry, Doppelgänger Killer 1-25, Region Whisper Line
★★★★☆: Liars. Liars Everywhere., Sandwiched XV Squishmates, Fireworks 2025, (Yin)German Pairrows, Little Galaxy, 2x Solution, Hit Me Baby One More Time
★★★★★: Any NEWS?, Potentially Pointer, Possibly Parity Party
Solution code: Fourth (4th) column of the grid from top to bottom (with the symbol "/" marking borders between regions, e.g., 1/23/456/7).
Comments
on 19. August 2026, 20:20 by puzzlepandit
Indded very intresting combinations of maths, sudoku and logic.
on 19. August 2026, 11:09 by GeorgeTheToad2
Lovely idea for a CC puzzle. Approachable too.
on 17. August 2026, 13:25 by Franjo
Thank you very much for creating and sharing this nice CC-puzzle. Interesting constraint!
on 17. August 2026, 12:54 by sujoyku
Superb construction! I absolutely loved it. Thank you, SennyK!
on 17. August 2026, 10:28 by ralphwaldo1
Couldn't give it 6/7 so rounded up! :)
on 17. August 2026, 08:32 by KNT
really fun CC, thanks!
on 17. August 2026, 03:06 by Chaossudokusplease
Great puzzle! Very approachable and smooth without ever being too 'automatic'. Such a fun process from start to finish! The most difficulty I had was realising that I was trying to enter the 5th column as the solution instead of the 4th...
on 16. August 2026, 20:10 by amirs
Lovely puzzle, I enjoyed it a lot. The break-in is beautiful and everything just flowed smoothly afterwards.
