Spooky Action at a Distance
(Published on 29. October 2025, 02:13 by juggler)
- Normal Sudoku rules apply.
- Some cells contain ghosts. Not all ghosts are visible!
- Each ghost with the digit N is staring at another ghost with the digit N, exactly N diagonal steps away.
- A headstone shows the sum of the ghosts in its column.
Solution code: Ghosts in the bottom 3 rows
Comments
on 8. November 2025, 04:37 by Synergenesis
This is probably the hardest puzzle that I've been able to complete entirely on my own - 4/5 stars intimidated me but the concept was so fun that I had to try. Took me a bit over 2 hours, which for me is a win! Thanks for the puzzle.
on 3. November 2025, 20:58 by marty_sears
Beautiful! I got there in the end. This was very challenging for me but I loved it. So many gorgeous interactions between ghosts, and the two tombstones added a really nice extra layer of logic which complimented the diagonal ghost logic perfectly. Perfect halloween treat
on 3. November 2025, 08:35 by Bankey
@juggler, is the visibility confined to the available straight diagonal line till the edge of the grid, or can the line of sight continue after bouncing off the grid edge ? In other words, for example, can a ghost at r2c3 see another ghost at r3c6 if both were a 3 ? Thanks.
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juggler: Sadly, there are no mirrors in this puzzle, just ordinary sight lines :)
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Thanks, juggler. Clearly, ghosts don't like mirrors :).
on 31. October 2025, 20:15 by PhysicistFromFunen
So many great deductions and aha moments one after another - but don’t forget to do a bit of sudoku!
on 31. October 2025, 14:02 by Exigus
3.5*for me, some very nice logic embedded in there. Thanks!
on 30. October 2025, 00:34 by polcat
Amazing. Thank you!
on 29. October 2025, 22:42 by eladv
Thank you juggler! This was incredibly difficult, but rewarding.
I wonder if I missed some grand principle: for me there was a lot of work disambiguating options, especially towards the end of the solve.
on 29. October 2025, 20:52 by blackjackfitz
Really interesting geometric properties in this, loved it thanks!
