Quadsumes
(Published on 19. January 2026, 08:15 by SennyK)
Today we have puzzle created for Scojo's prompt, as redeemed by MathGuy_12, to create a puzzle that highlights the interaction between a sum dot and another constraint :-)
I hope you will enjoy and I would be really grateful for all the comments and ratings.
Normal sudoku rules apply.
Sum dot: Digits in cells touching a gold sum dot must sum to the indicated total. Digits may repeat if allowed by other rules.
Quadruples: Digits in a sum dot must appear within the four surrounding cells.
Recommended for you: Modified Flat Mates
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, 29, 30
★★★☆☆: 9, 19, 21, 22, 28 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
★★★☆☆: Tetromino Sudoku
Various Puzzles:
★☆☆☆☆: Blown Fuses in Electrical Installation, Let Me Introduce Myself, French Wrench, GAS Regional Constraints
★★☆☆☆: 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
★★★☆☆: Cops & Robbers, Positive Symmetry, Doppelgänger Killer 1-25, Region Whisper Line, Christmas Chaos
★★★★☆: Liars. Liars Everywhere., Sandwiched XV Squishmates, Fireworks 2025, (Yin)German Pairrows
Solution code: Ninth (9th) row of the grid from left to right.
Comments
on 5. February 2026, 22:22 by bleppie
Nice, smooth logic throughout
on 3. February 2026, 19:47 by damo_89
What a lovely puzzle. Harder end of 1* but very fun when you see the tricks
on 22. January 2026, 11:56 by Zelfie
Quadruples + maths = a lot of fun, thank you for this lovely puzzle!
on 22. January 2026, 10:19 by Ol-Jay
Wow, very cool! Always enjoy a new constraint with a satisfying logic. :)
on 20. January 2026, 12:33 by marajade
Delightful! I've always enjoyed the quadruple constraint and I loved exploring the logic that came from adding this extra little complication to the constraint!
on 20. January 2026, 11:27 by Fra314
Excellent puzzle, great fun!
on 20. January 2026, 08:52 by NotVeryNeat
Woohoo!! A blast to solve!
on 20. January 2026, 05:40 by meggen033
Very nice puzzle! Thanks!
on 20. January 2026, 01:09 by 99%Sneaky
A superb execution of the ruleset!
on 19. January 2026, 20:37 by Caconym
Very nice, easier but still very clever setting. Thanks for sharing and making my commute more fun
on 19. January 2026, 16:13 by HeyItsErin
Another stellar puzzle from you! Would love to see a 2* version of this!
on 19. January 2026, 15:32 by varbrad
Interesting! Thanks :)
on 19. January 2026, 15:12 by MathGuy_12
Very nicely done!
on 19. January 2026, 14:24 by macintux
Currently sitting at a well-deserved 99% rating, great job.
on 19. January 2026, 13:30 by rojspencer
Fun combination of constraints. Thanks!
on 19. January 2026, 11:17 by Wuschel
Very nice, thank you!
on 19. January 2026, 08:21 by juggler
Neat!
