Logic Masters Deutschland e.V.

Rules:

Standard Sudoku Rules Apply: Fill the grid with the digits 1–9 so that each row, column, and 3 x 3 box contains each digit exactly once.

The grid is partitioned into three types of cages. The solver must determine the location and color of these cages.
Red Cages: There are 9 single-cell Red cages in the grid. Each Red cage contains the digit 1.
Yellow Cages: There are 9 four-cell Yellow cages. Each Yellow cage contains the set of prime digits: {2, 3, 5, 7}.
Blue Cages: There are 9 four-cell Blue cages. Each Blue cage contains the set of composite digits: {4, 6, 8, 9}.

Kropki dots are only found on the boundaries of 4-cell cages. Kropki dots never touch a Red cage.

Black Dots: A black dot indicates that one digit is exactly double the other. Black dots only appear between cells of the same color.

White Dots: A white dot indicates the digits are consecutive. White dots only appear between cells of different colors.

Solve on Sudokupad