Sub categorizing
(Published on 30. March 2026, 05:30 by NicoD)
Rules
Normal sudoku rules apply.
Each outside clue is simultaneously X-sum, sandwich, and full rank, which must all be the same number.
X-sum: clues indicate the sum of the first X digits, where X is the first seen digit.
Sandwich: clues indicate the sum of the digits between the 1 and the 9 in that row/column.
Full rank: considering all rows and columns as 9-digit numbers read from the direction of the clue and ranked from lowest (1) to highest (36), a clue represents where in the ranking that row/column lies.
Solution code: Rank 16 number
Comments
on 31. March 2026, 22:14 by NicoD
Edit: rules clarification.
on 31. March 2026, 01:31 by bansalsaab
Does the greater than or less than clue have to be same? For example does >12 mean xsum can be 15 rank could be 25? Both are >12. Or all values have to be same.
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ND: The number is the same for all 3 conditions.
on 30. March 2026, 21:34 by Exigus
Amazing that it solves, incredible construction but quite tricky. Thanks!
on 30. March 2026, 21:33 by m0rkoli
Hard and beautiful puzzle! ty!
on 30. March 2026, 17:46 by marcmees
Excellent puzzle. Thanks
on 30. March 2026, 10:44 by Elliott810
Absolutely brilliant construction! Thank you:)
on 30. March 2026, 10:07 by Snookerfan
Wow, incredible puzzle! Thanks
