Logic Masters Deutschland e.V.

It is once again a great pleasure to feature in the long-running Dutch Flat Mates series by Flinty. This week the paired constraint is Binary Sum Arrows. If you'd like other puzzles featuring this constraint, I can recommend the following by its creators:

• Binary Sum Arrows by RockyRoer
• Difference Engine by sshrpe

Rules:

• Normal sudoku rules apply: Place the digits 1 to 9 once each in every row, column, and 3x3 box
• Dutch Flats: Every 5 in the grid must have a 1 directly above it or a 9 directly below it. It may have both, but it doesn't need both
• Binary Sum Arrows: Arrows contain "binary sums". Each cell along the arrow is a bit, starting with the most significant bit and going to the least significant. If a cells contents are odd, that puts a 1 in that bit, and if a cells contents are even, that puts a zero in that bit. The digits in the bulb of the arrow are that sum expressed as a one or two-digit decimal number (read from left-to-right)
  • (For example, a five cell arrow would have a 16's bit, an 8's bit, a 4's bit, a 2's bit, and a 1's bit. Cells with odd odd even even odd along that arrow would then give a binary sum of 16 + 8 + 0 + 0 + 1 = 25)

Play on Sudokupad

Download full solution guide (PDF)

Previous Dutch Flat Mate Puzzles
This has been a weekly series since '18 Oct 23'. Here is a spreadsheet link for all the previous puzzles in the series, which also has a few teasers for upcoming constraints/guest setters in the series (subject to change).

This alternative link offers a limited LMD search for Dutch Flat Mates.