Logic Masters Deutschland e.V.

Irregular 4x4 Sudoku: Place the digits 1-4 exactly once in every row, column, bold-outlined region, and marked diagonal.

Renban Lines: Purple lines in the grid are Renban lines. Digits on a line form a set of non-repeating, consecutive digits in any order.

Kropki Dots: Digits separated by a white dot are consecutive. Digits separated by a black dot have a 1:2 ratio, meaning one is exactly double the other.