Minimality deductions proof of concept
(Published on 21. February 2026, 18:15 by SudokuFan)
Proof of concept of new (to me) metalogic
- Yin-Yang: Place either a 0 or a 1 in each cell such that all 0s are orthogonally connected, all 1s are orthogonally connected, and every 2x2 area contains both 0s and 1s.
- Fog: Some cells are hidden by "fog" meaning you cannot see their contents. Some fog may be removed when a digit is correctly filled. Digits can be logically deduced, no guessing is needed.
- Minimality: The puzzle has a unique solution when all the fog has been cleared, but removing any given digit would make the puzzle nonunique.
Solution code: Row 4
Last changed on on 21. February 2026, 18:20
Solved by SKORP17, PippoForte, saskia-daniela, CJK, TheZwierz, Crulamin, LJ Jamie, WvdWest, puzzler05, webato, kangaroo, Blake Saligia
Comments
on 23. February 2026, 03:03 by LJ Jamie
The domino hint and the "removing any given digit" rules are vital but make for a very rewarding puzzle
on 21. February 2026, 18:20 by SudokuFan
fixed link
