Sandwich Sums

Sandwich Sums

Rules:

  • Classic Sudoku:

    Every row, column and 3x3 box must contain every number from 1 to 9.

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  • Sandwich Sum Lines:

    Every digit along an ochre line (except the ends) must equal the sum of its two neighbours; if the sum is greater than 9, it wraps around (e.g. 10→1, 11→2 etc.).

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  • Counting Circles:

    Any digit in a circle indicates exactly how many circles contain that digit.

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  • Kropki:

    Two digits separated by a white dot are consecutive; two digits separated by a black dot have a 1:2 ratio.

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Play it online in SudokuPad.

This puzzle is also on Logic Masters Germany.