description Sandwich Sudoku Overview
Sandwich Sudoku is a Sudoku variant in which additional clues placed outside the grid indicate the sum of the digits positioned between the 1 and the 9 in each row and column. The name derives from the concept that the intervening digits are sandwiched between those two values. Standard Sudoku rules still apply, so solvers must integrate the sandwich sum constraints with the usual row, column, and box restrictions to arrive at a unique solution. The variant gained wider public recognition through the YouTube puzzle channel Cracking the Cryptic.
insights Ranking position
Sandwich Sudoku ranks #45 of 93 in the Logic Puzzle ranking, behind Galaxies, ahead of Cave.
help Sandwich Sudoku FAQ
What are the rules of Sandwich Sudoku?
In Sandwich Sudoku, standard Sudoku rules apply, but clues outside the grid indicate the sum of the digits placed between the 1 and the 9 in that specific row or column. If the clue is 0, the 1 and 9 are adjacent with no numbers between them, while a clue of 35 means all the digits from 2 to 8 sit between them.
Who invented the Sandwich Sudoku puzzle?
The puzzle was created by Japanese puzzle designer Yoji Sato. It gained widespread popularity in the West after being featured regularly on the British puzzle YouTube channel Cracking The Cryptic, hosted by Mark Goodliffe and Simon Anthony.
What is the highest possible clue number in Sandwich Sudoku?
The highest possible clue in Sandwich Sudoku is 35, which means the digits 2, 3, 4, 5, 6, 7, and 8 are all sandwiched between the 1 and the 9. This sum requires those seven intermediate digits to be placed in sequential order somewhere between the two outer "bread" numbers.
Where can I play Sandwich Sudoku?
You can play digitized versions of the puzzle on mobile platforms, including the Cracking The Cryptic apps available on iOS and Android. Additionally, many modern Sudoku puzzle books and daily newspaper puzzle sections now feature this 1-to-9 variant alongside traditional grids.
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