Permutation City
(Published on 20. January 2026, 09:47 by juggler)
Each small grey 4x4 grid is a "mean mini": select 4 unique digits from 1-8 and place them once each in every row, column, and 2x2 box. The set of 4 digits must be different for every 4x4 grid.
Each 2x2 is a cell of the giant 8x8 Sudoku, and its value is the sum of its blue shape. The giant 8x8 Sudoku uses 8 unique values (to be determined), which occur once each in every giant row, column, and 2x4 box.
Digits connected by an "=" are the same.
(Example 2x4 box)
Solution code: Row 10
Comments
on 31. January 2026, 22:30 by ymhsbmbesitwf
Amazing and mad.
on 27. January 2026, 01:49 by Atticus837
Brutally hard, wading through the grid searching for the next deduction... Although with a grid this size that's not really a surprise.
Beautifully constructed, and very satisfying to finally complete.
on 21. January 2026, 18:22 by eladv
whew, that was a wild ride!! What a fun puzzle! Assigning a difficulty rating for this is tricky, because none of the deductions are more than 3* (it was really surprising how the puzzle sort of solved itself, using me as a conduit), but the puzzle is so huge and long that it took me more than three hours anyway! It's a 5* duration with 3* deductions: I'll split the difference and make it 4* :).
on 20. January 2026, 23:37 by gfoot
This is exquisite, maybe not as hard as it first looks, it flows very well when you work out how to approach it
on 20. January 2026, 17:52 by Krisonium
It is brutal since you need to keep track of all of the permutation, but other wise very solvable and intriguing puzzle!
on 20. January 2026, 16:23 by vfig
a puzzle named after the first egan i encountered? i have to try this!
on 20. January 2026, 12:12 by eladv
Whow, this is insane, and I'm totally here for it
