Shifter Lines 105: Phistomefel? Who's that?!
(Published on 27. November 2023, 14:58 by gUBBLOR)
Shifter Lines 104: Shift your foglights on
Shifter Lines 106: Searching for 5s
All my series:
Equality Cages
EquaLite Cages
Shifter Lines
Shifter Dots
Be aware that if the name doesn't immediately tell you something about the puzzle, you might have a hard time solving it.
Rules:
Normal Sudoku rules apply. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box.
Shifter lines: Adjacent digits within the same box on a shifter line share both parity (even/odd) AND polarity (low/high). Whenever the line enters a new box either the parity OR the polarity shifts, never both. Shifter lines can never have 5 on it. Digits may repeat on lines.
Kropki dots: A black dot between cells indicates cell values with a 2:1 ratio. A white dot between cells indicates cells with consecutive values. Not all dots are shown.
XV: Adjacent cells connected with an X must sum to 10. Adjacent cells connected with a V must sum to 5. Not all X's or V's are shown.
Even/Odd: Cells with a filled square must be even. Cells with a filled circle must be odd.
Solve here:
Sudokupad
Video featuring the puzzle:
Sudoku Sleuth (using the Phistomefel ring)
Sudoku Sleuth (solving without Phistomefel ring)
Solution code: A completion message with the solution code will be available when the puzzle has been solved on Sudokupad!
Comments
on 3. October 2025, 12:52 by ThatUnfunPerson
I didn't quite remember the Phistomefel Ring, so didn't know how to use it. I looked it up after and I'm still not quite sure how it would help.
Is it for exclusion or inclusion purposes, or perhaps both? Maybe I should look up some ring specific puzzles and see if I start to understand it's use.
on 28. January 2025, 09:46 by gUBBLOR
Changed solution code
on 11. October 2024, 19:19 by burgermason
09:40, great puzzle
on 9. June 2024, 09:39 by maiaz
Don't know phistomefel .. but this was fun to solve by solving odd/even
on 20. April 2024, 12:59 by NEWS
I found that using Phistomefel is not faster than not knowing this trick. Anyway, great puzzle.
on 10. March 2024, 03:08 by ElMrBlack
super fun to solve
on 9. March 2024, 18:37 by gUBBLOR
Added links
on 11. February 2024, 15:41 by gUBBLOR
Added video link to the puzzle being solved
on 24. January 2024, 00:49 by Ganbatte
People have used “smooth solve” as a description and with this puzzle, I finally understood what they meant. Very fun!
on 12. December 2023, 23:43 by gUBBLOR
Added some links
on 29. November 2023, 15:37 by longeill
Finished in under an hour which is pretty good for me at this point. I'm not sure if there's more to understand about Phistomefel outside of the relation between the yellow and gray squares, but I don't know that I would have been able to solve if not for that simple fact.
on 28. November 2023, 02:54 by MarkSud
Very nice, but I also found I did not need to use Phistomefel to solve this.
on 27. November 2023, 20:02 by Melriken
More Shifter Lines Please! :)
