Put a number from 1 to 9 in each cell so that in each row, column, and 3x3 box no number occurs exactly once. I.e. if a number occurs at all, it must occur at least twice.
I created most of the puzzle by hand, but used a computer program that I wrote to explore ways to finish it.
The puzzle is available on Penpa.
Lösungscode: Row 3 and column 8.
am 24. November 2023, 05:10 Uhr von Nylimb
If you'd like to watch someone solve this, see https://www.youtube.com/watch?v=uQnwojobKqk . If you don't speak Russian, then turn on closed captions with autotranslation to your preferred language.
am 22. Oktober 2020, 23:37 Uhr von Nylimb
Added penpa link.
am 24. Juni 2020, 21:05 Uhr von Big Tiger
That was intriguing, mind-bending, and as minutes turned into hours, a tad frustrating, ha ha. Nicely done.
am 17. Februar 2020, 06:54 Uhr von Nylimb
Improved terminology.
am 4. Februar 2020, 19:13 Uhr von Phistomefel
What a creative puzzle!
am 2. Februar 2020, 07:41 Uhr von Mody
Sehr kreative Idee :)
am 28. Januar 2020, 18:39 Uhr von Rollo
Eine tolle Idee :-) und ganz schön mühsam, ich muss erstmal kapitulieren und später noch mal von vorn anfangen.
am 28. Januar 2020, 14:06 Uhr von adam001
Very nice!