Sandwich Sudoku

In sandwich sudoku, the numbers along the edges of rows and columns show the sum of the digits "sandwiched" between the 1 and the 9 in that row or column.

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Sandwich Sudoku rules

  1. 1
    Rule 1

    The classic row, column, and 3x3 box rules apply as usual.

  2. 2
    Rule 2

    The number to the left of each row, and above each column, is a clue.

  3. 3
    Rule 3

    It's the sum of the digits that fall between the 1 and the 9 in that row/column.

  4. 4
    Rule 4

    The 1 and 9 themselves aren't included in the sum — only what's between them.