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About Sandwich Sudoku Puzzles

Sandwich Sudoku Puzzle Rules

The rules of Sandwich Sudoku are as follows:

Here is an example sandwich sudoku:

Sandwich Sudoku Puzzle

So there is one key extra rule that distinguishes between sandwich sudoku and standard sudoku: the numbers around the grid. In a 6x6 puzzle, these numbers indicate the sum of the digits between the 1 and 6 in each row and column. In a 9x9 sandwich, they indicate the sum of the numbers between the 1-9. For instance, a total of 0 means that the two digits (1 and 6 or 1 and 9 as relevant) are adjacent to each other, whilst a sum of 4 means that the order in a 9x9 puzzle must be 149 or 941 somewhere in the row or column. That's because a total of 4 can only be made in one way, the single digit 4 (we can't use 1+3 as the 1 is reserved for the outside of the sandwich and of course 2+2 involves repetition). Where things can get particularly interesting is with numbers that can be made with different lengths of sum, for instance 11 could perhaps be 2+3+6 or 7+4.

If you would like a visual explanation of the rules, here is a video outlining the sandwich sudoku rules as explained above:

Play A Sample Sandwich Sudoku Puzzle

If you'd like to have a go at solving sandwich sudoku, we have two options for you:

  1. Play a sample 6x6 sandwich sudoku - this is recommended if you've never played sandwich sudoku before as it will introduce you to how the puzzle works whilst being quicker and simpler to solve.

  2. For a 9x9 sandwich sudoku, you can play the example puzzle above, with our Online Sandwich Sudoku Puzzle Player

If you enjoy this puzzle type, you can join our online Puzzle Connoisseur's Club for £12 or $17 a year and play a new Sandwich Sudoku Puzzle puzzle every day of the year, together with many other fun and interesting logic puzzles.

Strategy and Solving Tips for Sandwich Sudoku

All our sandwich sudoku puzzles can be solved using logic, and have a single, unique solution. No guessing is ever required, just careful thinking. Here are some strategy tips:

If you'd like to watch a video-solve of the example 6x6 sandwich sudoku puzzle, then you can do so here: