Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Each row, column, and 3x3 box contains each number from 1 to 9 exactly once.

Disjoint Sudoku rules apply. Cells that appear in the same position relative to their default regions must not contain the same number.

Sandwich Sudoku rules apply. The numbers outside the grid show the sum of the digits sandwiched between 1 and 9 in that row or column.

Grey cells with arrows facing outward must contain numbers greater than all orthogonally adjacent cells.

Grey cells with arrows facing inward must contain numbers less than all orthogonally adjacent cells.

The puzzle is also available online.