Anti-sudoku puzzle #2
(Published on 2. February 2020, 23:58 by Nylimb)
This is the opposite of a sudoku puzzle:
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.
This puzzle seems to be slightly harder than Anti-sudoku puzzle #1.
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.
Solution code: Column 4 and column 6.
Comments
on 22. October 2020, 23:40 by Nylimb
Added Penpa link.
on 17. February 2020, 06:53 by Nylimb
Improved terminology; added difficulty comment.
on 4. February 2020, 22:18 by Ragna
Vielen Dank für alle Hilfe!
Sehr kniffelig :-)
on 4. February 2020, 07:16 by Nylimb
@cdwg2000: True. In fact, it's possible for only 1 or 2 numbers to appear in a row, column, or box. But I haven't managed to make a good puzzle in which that happens.
on 4. February 2020, 07:12 by cdwg2000
Note: Only 3 numbers may appear in the row / column / 3 * 3 area！！！
on 4. February 2020, 07:03 by Nylimb
@Ragna: If you'll post a hidden comment describing what you've figured out, I'll try to think of a hint for you that I can put in a public comment.
on 4. February 2020, 04:34 by r45
@Ragna: Vielleicht einfach nochmal die Regeln lesen, es gibt ja verschiedene Möglichkeiten für die Anzahl verschiedener Ziffern in einer Zeile, einer Spalte oder einem 3x3-Gebiet.
on 4. February 2020, 00:13 by Ragna
Ich kriege die Sache mit den
9en nicht hin.
Hat jemand einen Tipp für mich?
on 3. February 2020, 15:47 by marcmees
more tricky than the first one
