Logic Masters Deutschland e.V.

Normal Sudoku rules apply.

The sum of the cells in a cage must equal the total given for that cage. Digits in a cage do not repeat.

A cell with a blue rectangle is equal to the number of times a cell with the digit 3 is in any corner of any square having this blue rectangle as its center. A square is a group of multiple adjacent cells with the same number of cells horizontally and vertically.
For example, the cell in r4c6 is the center of three different squares, and if there is a total of four digits 3 in all the corners of those squares, then the digit in r4c6 is 4.

Digits connected by a red dot have a 1:3 ratio (one is triple the other).