Sandwich X-tras
(Published on 16. September 2025, 03:56 by EPH)
by EPH (ephsudoku@yahoo.com)
Standard sudoku rules apply: each row, column, and 3x3 box must contain all the digits from 1 to 9.
Clues outside the grid are dual: They are sandwich clues, giving the total of the digits between the 1 and the 9 in the row or column. They are also X-sums clues, giving the total of the first X digits in the row or column. X is the digit in the first cell seen from the clue.
A white dot separates digits with a difference of one. Not all dots are given.
Solution code: Enter column 5 from top to bottom.
Comments
on 20. September 2025, 03:50 by EPH
@VitP, I appreciate your support. I think it has the rating that it has because it can be solved in the standard ways you mention.
on 19. September 2025, 22:50 by VitP
something wrong with both the quality rating - too low.
it's a fine puzzle with zero defects, including a simple ruleset, sparse clues, and a direct flow.
... and the difficulty rating - too high.
solves by standard application of the normal procedures, and basic sudoku.
when we mark homework and exams at university, it's not automatic, but is important, to use OBJECTIVE algorithms. the ratings on this site quite often miss this target by a substantial amount.
on 17. September 2025, 09:41 by brandon_bot
Tricky tricky
on 17. September 2025, 02:46 by josemadre
Love the dual clues!
on 16. September 2025, 12:09 by Franjo
Excellent setting. Thank you very much for creating and sharing this lovely puzzle.
