Logic Masters Deutschland e.V.

This puzzle has been constructed as a preparation puzzle for this years LM.

Rules: Blacken some cells and write a digit from 1 to 6 in every remaining cell, such that no digit appears multiple times per row or column. Numbers outside the grid indicate the sums of connected digits in that row or column in the correct order. In every row, either all or no outside numbers are given. Questions marks can be any number.

Cells with digits form one orthogonally connected component and all blackende cells are orthogonally connected to the grid border. Yellow cells are digit cells. A digit in a yellow cell indicates the total number of digit cells seen in vertical and horizontal direction until the next blackened cell or the grid border. The yellow cell itself is included in this count. All possible yellow cells are given.