Logic Masters Deutschland e.V.

Place subsets of digits 1-9 into every row, every column, and every 2-by-2 box so that no digit is repeated in any row, column, or box.

Kropki Dots: Digits separated by white kropki dots are consecutive, and digits separated by black kropki dots have 1:2 ratio. All possible dots are given.

Killer Cages: Digits in a killer cage sum to the clue in the top left corner of the cage.

Unique Ratios: The ratios of adjacent cells are unique, e.g., if R1C1 is 1 and R1C2 is 3, then there cannot be any pair of adjacent cells that have 1:3 ratio anywhere else on the grid.

Penpa+ link: https://tinyurl.com/ytxoplrn