Out-of-grid Kropki
(Published on 28. January 2026, 12:33 by rhyrhy)
Rules
- Normal 6x6 Sudoku rules apply within the grid, using digits 1 to 6.
- Digits placed outside the grid are from 1 to 9 and may repeat.
- Digits separated by a white dot are consecutive.
- Digits separated by a black dot have a 1:2 ratio (one is double the other).
- Kropki dots may be placed on the border of the grid or between out-of-grid digits.
- In all cases, the Kropki rule applies between the two adjacent digits, regardless of whether they are in-grid or out-of-grid.
- An out-of-grid clue with an arrow is a Little Killer clue.
- Digits along the indicated diagonal sum to the number shown.
- An out-of-grid clue without an arrow is an X-Sum clue.
- The clue gives the sum of the first X digits in that direction, where X is the first digit seen from the clue.
Solution code: Column 5 (7 digits, top to bottom)
Comments
on 11. February 2026, 02:37 by rhyrhy
Fixed link
(How did nobody tell me the title include 'testing' lol)
on 30. January 2026, 12:27 by rhyrhy
Improved ruleset
on 30. January 2026, 03:38 by CortexVortex
what a wonderful puzzle! simple but still a challenge
on 28. January 2026, 23:14 by SanFranSam
Did it with only checking my work once along the way. ;) The only thing in the rules i was uncertain about was whether the digits outside the grid could only be used once.
on 28. January 2026, 22:09 by dzamie
A fun little puzzle! I appreciate the little graphic for the solution code.
on 28. January 2026, 17:07 by SlitherWing
Very cute puzzle, loved it.
on 28. January 2026, 16:01 by HeyItsErin
Really great puzzle idea! Would love to see a 9x9 like this.
on 28. January 2026, 13:34 by Krisonium
I really thought the image near the solution code is a link to a previous puzzle, but it's just to highlight the referred column solution lol. Really awesome constraint and puzzle!
on 28. January 2026, 12:58 by rhyrhy
Changed link to the puzzle; now the puzzle also have corrected ruleset
on 28. January 2026, 12:56 by pjot
Fun idea!
