German Sums 6 (Chaos Construction Edition)
(Published on 21. July 2026, 07:00 by SennyK)
Today we have German Sums puzzle created for Scojo's prompt, as redeemed by gdc, to create an approachable Chaos Construction puzzle :-)
My inspiration for this puzzle was Ascending From Chaos by sujoyku.
According to testers, the puzzle is somewhere between high 2* and low 3*.
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, and place the digits 1-7 exactly once in each row, each column and each region.
7x7 German Sums: A clue outside the grid gives the sum of all continuously adjacent digits with a difference of at least 4 up to (and not including) the first digit with a difference of 3 or less in that row or column from the direction of the clue. A digit in the first cell is always included in the sum.
For example, if row 1 is 7435162, then the sum would be 7 from the left side and 14 (2+6+1+5) from the right side.
Region Building: For each clue, all the digits contributing to its sum must belong to the same region, and the first digit not contributing to its sum must belong to a different region.
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 German Sums Series:
★★☆☆☆: 1, 3
★★★☆☆: 2, 4, 5 Shading/Ying-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 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, Christmas Chaos
★★★★☆: Liars. Liars Everywhere., Sandwiched XV Squishmates, Fireworks 2025, (Yin)German Pairrows, Little Galaxy, 2x Solution
★★★★★: Any NEWS?, Potentially Pointer, Possibly Parity Party
Solution code: Second (2nd) row of the grid from left to right (with the symbol "/" marking borders between regions, e.g., 1/23/456/7).
Comments
on 29. August 2026, 17:47 by lindap
I struggled with this for a while because I hadn’t fully comprehend the rule that the first digit after the region break must be 3 or less different.
on 26. August 2026, 00:35 by MattJones
Wonderful - but I found it very tricky for 90% of it. Great setting.
on 14. August 2026, 00:03 by yuripuppies
Very nice! I managed to misread the instructions so it took me longer than it should have, but still very fun and intuitive. Only one thing... shouldn't the constraint be called Dutch Sums?
SK: Thank you for solving! :-) If it was 9x9, then yes, but in 7x7 German Whispers have difference of at least 4, the difference varies between different grid sizes.
on 2. August 2026, 03:23 by Crusader175
Very nice!
on 23. July 2026, 18:44 by damo_89
Very nice, though for me trickier than sujoyku so giving a 3*.
on 21. July 2026, 13:24 by Flinty
Easy dubz!!
on 21. July 2026, 12:50 by gdc
Fun use of the German sums constraint.
on 21. July 2026, 12:18 by Christounet
Very cool! Thanks :)
on 21. July 2026, 11:13 by amirs
Lovely puzzle. I agree with the high 2* estimate.
on 21. July 2026, 09:05 by sujoyku
I love your German Sums constraint. Thank you for this awesome puzzle, SennyK!
