Logic Masters Deutschland e.V.

Author: 真笑(洪卫华), from China, this question comes from his personal blog.

This is a new variant of Sandwich Sudoku. It is created using the variable order of the sandwich numbers. It is also the seventh question of the series. There may be more interesting combinations of variants later.

69Sandwiches(7)--XY Index2

1.Standard irregular Sudoku rules;

2.If the number X appears before the number Y, the sum of the numbers between them is marked as a black number, if the number X appears after the number Y, the sum of the numbers between them is marked as a red number;

3.The number X is the first number in the previous row (column), the number Y is the last number in the previous row (column), the first row (column) X=1, Y=9.

This is a sample

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