Logic Masters Deutschland e.V.

Normal Sudoku rules apply.

Normal two-color Japanese Sums rules apply. The colors used in this puzzle are black and red.

Outside the grid are colored clues. These clues indicate the sums of the contiguous regions in that row or column that should be shaded the color of the clue. However, if the clue is BLUE, then both black and red regions must be found in that row or column. Furthermore, there must be an unshaded cell between regions of the same color, though there is no need in between regions of differing colors.

f-puzzles: https://f-puzzles.com/?id=ydbdw3rj