Ions
(Published on 21. October 2025, 21:17 by mimec)
Ever since I published Odd Fives and Even Sevens, I've been thinking about creating a puzzle with two "special" digits. Recently I discovered that this might work with low/high digits, where a 1 can't touch another low digit, and a 9 can't touch another high digit, although this rule is surprisingly restrictive.
Rules:
- Normal sudoku rules apply.
- Every cell orthogonally adjacent to a 1 must be at least a 5 and every cell orthogonally adjacent to a 9 must be at most a 5.
- Cells connected by an X must sum to 10. Cells connected by a V must sum to 5. Digits connected by a white dot are consecutive. Not all Xs, Vs and dots are given.
Solution code: Row 7
Solved by Siebuhh, sujoyku, OutOfMyMindBRB, Megalobrainiac, Philologos, dickey, cryptique, Piff, BorisTheSnake, SKORP17, Starlight, DarthZeta, Fredxl, TripleABattery, Nagesh, StevenS, Corey115, fredchen, b413x, paranoid, Julianl, gxorgx, QuiltyAsCharged, joelth, benisjammin, Llamaths
Comments
on 14. November 2025, 15:35 by QuiltyAsCharged
I agree it's surprising how restrictive this rule can be. It creates quite interesting interactions. Very nice puzzle!
on 22. October 2025, 14:55 by BorisTheSnake
Probably closer to a 4* than a 3*, but very beautiful logic. I was surprised it worked, but it did. Loved it, thanks!
