Logic Masters Deutschland e.V.

Featured on Cracking the Cryptic:

https://youtu.be/FYaBR_jWnFs?si=v_a5TBBuUkXLVr6W

THE RULES:

Ordinary sudoku rules apply: place the digits 1 through 9 in each row, column, and 3x3 bold outlined box.

The pair of digits across each white dot differ by 1.

Ornithologically adjacent rule: Birds indicate ratios. Any pair of digits across a bird are in the same ratio to each other as are all pairs of digits across that type of bird. Different birds might share a ratio, but different ratios do not share a bird.

Not all birds are given.

Return of the Birds