Logic Masters Deutschland e.V.

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

The white dots represent a difference of 1 between two neighbouring cells. NOT all possible white dots are indicated; a.k.a. no negative constraint.

The grey squares are even numbers.

Note: One of the grey squares is not necessary for the solve, it is in the grid only because of symmetry.

The puzzle is also available online.