Cheryl's Sudoku
(Eingestellt am 3. Juni 2025, 03:50 Uhr von Elytron)
Löse es auf SudokuPad.
Regeln:
- Albert, Bertrand, Carl und David sind perfekt logische Sudoku-Löser. Sie erhalten das folgende 4×4-Sudoku mit diesen Regeln:
- Normale 4×4-Sudoku-Regeln gelten.
- Ziffern in einem Käfig summieren sich zu dem Wert in der oberen linken Ecke. Diese dürfen sich wiederholen, sofern es andere Regeln erlauben.
- Jeder der vier bekommt einen Wert privat mitgeteilt:
- Albert kennt A, Bertrand kennt B, Carl kennt C und David kennt D.
- Dann findet folgender Dialog statt:
- Albert: „Noch keiner hier kennt eine Ziffer.“
- Bertrand: „Nun, jetzt kenne ich eine.“
- Carl: „Niemand anderes hat dieselbe Zahl erhalten wie ich.“
- David: „Jemand hier weiss mehr Ziffern als ich.“
- Nach diesem Austausch löst einer der vier das Sudoku vollständig.
Kannst du es auch?
Lösungscode: Zeile 1 von links nach rechts gefolgt vom Anfangsbuchstaben der Person, welche das Sudoku als erstes lösen konnte (4 Ziffern, 1 Buchstabe).
Kommentare
am 27. Juli 2025, 00:58 Uhr von Exigus
That was really cool. Flawless logic, a bit grindy at the start but then everything started falling into place. Thanks!
am 23. Juli 2025, 04:42 Uhr von Phistomefel
Very fun and unique puzzle! Thanks a lot, Elytron!
am 12. Juli 2025, 05:04 Uhr von TheNineElements
Solve Time: 25:57
I rated this 4/5 difficulty.
This was one of the most interesting & unique puzzles I have ever seen - I will need to check out the referenced puzzle this one was inspired by! This puzzle has a very interesting (and unusual) premise, and the solving logic/approach was totally unexpected and tricky. Everything about this puzzle felt different (in a good way) from any other sudoku I've seen.
I really liked how the structure of the clues (each of the statements made by each solver) led me down a logical solve path, with each new clue leading me down a rabbithole of compounding deductions. It felt like solving a riddle, with just a bit of straightforward classic & killer (w/ repeats) sudoku sprinkled in. The clues were all very engaging, and it was really cool how the "pure" logic (meaning, informal written/spoken logic) interfaced with sudoku geometric & killer cage logic. All the clues/statements were rewarding and worked in totally unexpected ways.
My favorite aspect of the puzzle was probably the very last disambiguation (determining who finally solved the puzzle; and then solving it) - but that whole last idea was absolutely diabolical. The break-in (first clue) was also brilliant and was such a cool idea that really "set the stage" for the rest of the puzzle.
Regarding difficulty, I think that 4* is reasonable. The whole puzzle flowed quite smooth for me once I managed to solve/understand the first clue & begin making pencilmarks. The middle two clues were probably a bit easier than the first, but definitely not trivial. The midgame may have felt a bit easier because the break-in helped me understand "how" the puzzle rules worked - but, either way, that final clue was definitely trickier! The logic itself wasn't too difficult, but I got stuck at the very end of the puzzle for several minutes just re-reading the rules until I asked the right questions. Like mentioned before, I think 4* is fair; my time of 26 minutes for a 4*4 sudoku puzzle definitely reflects that.
I have absolutely no idea how you managed to create & set this puzzle - but thank you for doing so & sharing it here!
am 24. Juni 2025, 09:29 Uhr von konjecture
Beautiful logic
am 13. Juni 2025, 04:51 Uhr von kdkirby
Wow, this is a masterpiece. Sending this to my philosophy professor who works on epistemic logic and problems of common knowledge. Thank you so much!
am 10. Juni 2025, 02:02 Uhr von antiknight
Beautiful idea to put into a Sudoku puzzle!
am 9. Juni 2025, 13:03 Uhr von mscha
Amazing! Didn't think I was going to solve it, but I managed to stay ahead of Simon while watching his CtC solve (with a lot of pausing).
SudokuPad says I solved it in 13:37 (!), but that's because I only opened it once I had a digit to put on there (after at least an hour).
am 7. Juni 2025, 21:55 Uhr von SudokuExplorer
Unbelievable! I’m amazed this solves logically with such vague clues, thanks a tonne for creating this :-)
am 7. Juni 2025, 17:05 Uhr von jwsinclair
Brilliant :)
am 7. Juni 2025, 10:35 Uhr von juggler
Best thing I've solved in ages, what an amazing logic puzzle!
am 6. Juni 2025, 17:21 Uhr von Elytron
A few rewordings to make the rules clearer.
am 6. Juni 2025, 05:40 Uhr von jinkela114514
Hope that this puzzle can be featured on CtC channel.
am 5. Juni 2025, 15:41 Uhr von PjoeterBliep
That certainly wasn't easy and required quite a bit of paper for taking notes!
Wonderful!
It blows my mind that this exists
am 5. Juni 2025, 08:45 Uhr von TannersES
genius！no more word i can say
am 5. Juni 2025, 07:09 Uhr von Crusader175
Absolutely brilliant puzzle and everything can be deduced by logic. Very well constructed puzzle!
am 5. Juni 2025, 01:15 Uhr von blueberrypug
does "nobody knows any digits yet" mean they dont know the specific cell location of a digit, or just the specific digit content of a cage?
Elytron: Yes, it means that they do not know the exact location of any digit, i.e. they cannot place any digits yet.
am 3. Juni 2025, 20:22 Uhr von Enchanter73
This was a great thinking exercise, thank you!
am 3. Juni 2025, 15:34 Uhr von cyddrdrd
Brilliant!!!
am 3. Juni 2025, 05:52 Uhr von xiaoji
Nice logic in this intriguing puzzle. I've learnt the original birthday puzzle, but this puzzle still surprises me a lot.
