Schrödoku
(Published on 19. October 2026, 09:52 by berdy)
Bringing some of my quantum computing day job into the theming of this puzzle :)
This puzzle subverts the golden rule of only one solution by flipping that expectation on its head-- cells inside the Schrödinger's cages must have more than one valid value. The puzzle is to find the single unique solution that doesn't lock down the caged cells!
Rules
Classic SudokuEvery row, column and 3x3 box must contain every number from 1 to 9.
German whispersAdjacent digits along a green line have a difference of at least 5.
Renban linesDigits along a purple line form a set of consecutive digits in any order.
Kropki dotsDigits in cells joined by a white dot are consecutive.
Digits in cells joined by a black dot are in a 1:2 ratio.
Not all dots are given.
Schrödinger's cagesCells in cages must never be observed (collapsed to a single value).
Example: A caged cell that sees every digit 1-8 could only be a 9 and is considered "observed".
Fill in every cell outside the cages so that no caged cell collapses to a single value.
Exactly one fill keeps the caged cells unobserved.
For the solution checker, leave the caged cells empty (pencil marks are okay).
Solution code: Box 7
Last changed on yesterday, 01:40
Solved by Jooshy, Nyx_01, LuanMerlin, gladstone, nocturnomath, rdesmarais2, QuiltyAsCharged, PrissyP, SSG, elmers, Fusce, fryguy1013, garage, ViKingPrime, karlmortenlunna, jinkela114514, jkuo7, fthompson, Kurogamo, SingingFish, kangaroo, madhupt, ThomasR, P12345, Wiggel, bovine_buddha , DarkPaladin, Fool on Hill, 6rank
Comments
today, 19:39 by Fool on Hill
Great puzzle!
today, 01:07 by ViKingPrime
I'm dumbfounded by how good this is, by every measure.
yesterday, 01:40 by berdy
Thanks for the kind words and for trying out my puzzle!
Updated the page layout
on 21. October 2026, 08:34 by PrissyP
Very cool puzzle, an interesting idea with cool conclusions to start and some nice geometry and sudoku to finish it. Thanks :)
on 20. October 2026, 01:54 by QuiltyAsCharged
Very cool! The cells in superposition lead to some interesting logic. Really nice aesthetic design too
on 19. October 2026, 20:59 by rdesmarais2
Very nice. Took a minute to get going and understand the rule set. Thank you
on 19. October 2026, 12:30 by Jooshy
Awesome puzzle, thanks for sharing!
