Logic Masters Deutschland e.V.

Rules:

Normal sudoku rules apply. Digits on an arrow must sum to the digit in the corresponding circle. Digits cannot repeat on the marked diagonal. Clues outside the grid give the sum of the digits on the corresponding diagonals.

Digits in the boxes must be in proportion with each other, i.e. satisfy the equation. For example, if r1c4 is 1 and r2c4 is 2, then the digits in r1c5 and r2c5 must be either 3 and 6 or 4 and 8.

Link to f-puzzles

Link to sudokupad