15 friendly DJs Sudoku
(Published on 14. February 2021, 06:00 by ICHTUES)
- Normal Sudoku rules apply
- Disjoint Groups constraint applies: No two cells in the same position relative to their box may contain the same digit. Disjoint groups are numbered the same way boxes are
- A cell is friendly if it contains the same number as its row, column, box, or disjoint group
- There are exactly 15 friendly cells
- Killer Cages sum to a number that is friendly to both cells in the cage (i.e. R7C4 is friendly to 1478 and R7C5 is friendly to 2578, so the cage they are in sums to 7 or 8)
Solution code: row 5 and 8
Last changed on -
Solved by verticalsandwich, polar, DiMono, henrypijames, rimodech, Vebby, isajo4002
Comments
on 3. October 2021, 20:17 by Vebby
Lovely puzzle! Very interesting rule-set and break-in.
Last changed on 16. February 2021, 19:35
on 16. February 2021, 07:58 by henrypijames
Wow, the opening *is* unique - and I just found it by staring at the grid, without even any pencil-marking.
But after that, the rest was just tedious pencil-marking and eliminations. If there's a clear logical path consisting of big ideas, I couldn't find it.
@henrypijames
Are you interested in the solutions path?
<< Of course I am.
Last changed on 14. February 2021, 20:56
on 14. February 2021, 20:45 by verticalsandwich
What a cool idea to build a puzzle around. I loved this, the opening was so unique!
@verticalsandwich
Thanks. Glad you enjoyed it.
