Normal sudoku rules apply. Each row, column and box contains exactly one “deflection” cell. Each deflection cell contains a different digit. Clues outside the grid give the sum of the digits on the indicated diagonal. Digits may repeat along this sum. When a diagonal hits a deflection cell, the diagonal gets deflected clockwise by 90° ("makes a right-turn"). If a diagonal passes the same cell multiple times, that cell's value is counted multiple times towards the clue sum.