Logic Masters Deutschland e.V.

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Normal sudoku rules apply.

Draw a "train" in the grid. The train is a line of orthogonally connected cells that cannot loop or branch, and can touch itself diagonally but not orthogonally. Its "carriages" are 2-cell Killer cages. The first carriage sums to 3, and thereafter each carriage's sum increases by 1 going along the train until the last carriage, which sums to 17.

Cells marked with a grey square are not on the train. A digit in a marked cell, N, indicates that there are exactly N cells on the train in at least one of the same row or column as the marked cell. For example, a 3 in a marked cell could indicate that there are 3 train cells in that column; there can then be any number of train cells in that row, including 3.

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Highlight the text below for some hints!...

Consider general properties of the train, particularly regarding the last 4 cells at either end.

Consider the grid as a chessboard, and how the black and white squares relate to the beginnings and ends of carriages.