German Sum Introduction
(Published on 26. March 2026, 13:00 by SennyK)
Puzzle has been featured on:
- Logic Lemur Gaming YouTube channel: link
- Puzzle Patzer YouTube channel: link
- BremSter Puzzles YouTube channel: link
I have invented a new clue type, I hope I have managed to keep this puzzle easy enough to nicely introduce this new constraint :-)
I hope you will enjoy and I would be really grateful for all the comments and ratings.
Normal sudoku rules apply.
German sum: A clue outside the grid gives the sum of all continuously adjacent digits with a difference of at least 5 up to (and not including) the first digit with a difference of 4 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 4 is 728315469, then the sum would be 20 (7+2+8+3) from the left side and 9 from the right side.
German Sum Explanation:
Basically, you can imagine that you are drawing a German whisper line starting in the first cell next to the clue and ending in the last cell with the valid digit fulfilling German whisper line properties (adjacent digits have a difference of at least 5), and the sum of the digits on that German whisper line must be equal to the given total.
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
★★★★☆: 36, 39, 43 Shading/Ying-Yang:
★★☆☆☆: Pretty Odd Shaded Area
★★★☆☆: (+5)-Yang, Negative 8 YY
★★★★☆: Aim High! (YY)
★★★★★: Why-Why? Modifiers:
★★★☆☆: Modified Flat Mates, Neighbourhood Watch 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)
★★★☆☆: Tetromino Sudoku
★★★★★: 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
★★★☆☆: 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: Third (3rd) row of the grid from left to right.
Comments
on 15. May 2026, 11:00 by antzervos
Very nice constraint!
on 31. March 2026, 17:55 by bleppie
Nice new rule, I got stuck on the last bit because I forgot the negative constraint. Thanks for the puzzle!
on 30. March 2026, 02:54 by Crusader175
Fun idea and puzzle!
on 28. March 2026, 00:45 by Archon
A nice puzzle with a novel rule, thank you!
on 27. March 2026, 23:17 by abadx
The german sum is quite constrained, so once key cells are filled, puzzle cracks easily. The constraint is quite interesting and not too hard to devise the implications. Thanks for setting.
on 27. March 2026, 15:45 by Franjo
Thank you very much for creating and sharing this lovely puzzle with a fresh and nice constraint.
on 27. March 2026, 07:28 by ralphwaldo1
Gave me a surprise the way it broke, very nice. Neat idea and setting.
on 26. March 2026, 23:25 by sujoyku
Very nice puzzle with this fun new ruleset! Thank you, SennyK!
on 26. March 2026, 20:47 by wuc
Not only nicecrule. Its great applied here. Many amazing deveals in this solve including the last step. Great setting thx.
on 26. March 2026, 19:45 by WeakSolver
Good
on 26. March 2026, 18:49 by s1mn
That was great! Really nice new rule set.
on 26. March 2026, 18:21 by s1mn
"I have invented a new clue type"
Shut up and take my money. I'm in! :)
on 26. March 2026, 18:11 by RailMan
Very nice puzzle. Thank you.
on 26. March 2026, 17:22 by HeyItsErin
I like this a lot!! It would be super cool to see more of these.
on 26. March 2026, 14:02 by Puffke
Nice, can't wait to see it in combination with other rulesets.
on 26. March 2026, 13:30 by Flinty
Great Constraint...
