Four Colour Theorem
(Eingestellt am 19. März 2022, 13:12 Uhr von Jay Dyer)
Rules
- Each row, column, and 9-cell region must contain the digits 1-9 once each. The regions must be determined by the solver.
- Each region must be colored in its entirety with a single color. No two regions of the same color may share an edge, and at most four distinct colors may be used.
- Cells containing arrows give the distance to the nearest cell of the same color in each indicated direction (neighboring cells are a distance 1 from each other). All possible arrows are given.
Solve in Penpa+ (Answer check is on digits and edges).
Lösungscode: Columns 1 and 9
Kommentare
am 25. Juli 2025, 02:15 Uhr von Nell Gwyn
I also had a much harder time after the regions were drawn than drawing them. Still a fun puzzle though!
am 14. April 2025, 20:50 Uhr von adelaide
beautiful puzzle !
am 3. März 2025, 15:20 Uhr von StephenR
Super stuff, thanks. I may have missed some things, but the irregular sudoku at the end seemed very hard.
am 13. Juli 2023, 08:23 Uhr von tesseralis
this has been on my bucket list for months and I'm happy I've gotten to finally do it!
am 3. Juni 2023, 16:53 Uhr von Flambierter Flamingo
Holy shit, I can't believe I solved this! My first five star, thak you!
am 17. Oktober 2022, 13:04 Uhr von Vebby
Brilliant puzzle, a joy to solve!
am 16. September 2022, 23:29 Uhr von SHERAX
Another Genius Puzzle From One Of The BestConstructors.
An other masterpiece from him : Roman Lockout
(Only 5 times solved)(overlooked by almost everyone)
am 12. September 2022, 21:20 Uhr von derKrampus
The logic flowed very smoothly, after completing the regions I missed something for a long time so completing the irregular sudoku took me almost as much as building the regions did
am 12. September 2022, 03:18 Uhr von SimplePurpleFrog
Wow, really hard, but amazingly beautiful. It even flowed logically, though at a trickle :-)
am 12. Juli 2022, 00:48 Uhr von TotallyNormalCat
Definitely one of my favorite chaos constructions
am 11. Juli 2022, 19:16 Uhr von Niverio
Wonderful! Region building part was full of nice surprises :)
am 4. Mai 2022, 02:12 Uhr von OGRussHood
The rules were really wonky. Took me a half-hour just to latch on to them. Then I could actually do the puzzle. A brilliant work.
am 23. März 2022, 21:04 Uhr von 10feet
Wow, thank you!
am 23. März 2022, 19:42 Uhr von Krokant
A true marvel. One of my favorite sudokus so far. :)
am 22. März 2022, 21:49 Uhr von marcmees
amazing puzzle. thanks.
am 21. März 2022, 17:23 Uhr von SudokuExplorer
Discovering the regions was very enjoyable, thanks! :-)
am 20. März 2022, 19:16 Uhr von DiMono
Tricky and satisfying. Thanks!
am 19. März 2022, 18:17 Uhr von twobear
Great puzzle. Thank you!
am 19. März 2022, 17:16 Uhr von Jesper
Very nice, thanks!
am 19. März 2022, 15:24 Uhr von kolot
Wonderful, wonderful, wonderful!
One of the best puzzles of all time!
am 19. März 2022, 14:11 Uhr von Jay Dyer
Added some clarification to the rules about neighboring cells.
am 19. März 2022, 13:46 Uhr von twobear
Could you clarify on the last rule? Do neighboring cells count as distance zero or distance one? Thank you!
Neighboring cells are distance 1.
