Normal sudoku rules apply. There are no negative constraints. Box 1: Digits on the line are between the digits in the circles. Box 2: Digits on an arrow sum to the number in the circle. Box 3: DIgits in a cage sum to the given clue. Box 4: A digit in a circle must appear in one of the four surrounding cells. Box 5 is a magic square, with each row, column and 3-cell diagonal having the same sum. Box 6: Two cells joined by a black dot have a 1:2 ratio. Box 7: Digits joined by a V or X sum to 5 or 10 respectively. Box 8: The digit in the marked cell is less than its orthogonal neighbours. Box 9: Clues outside the grid show the sum of the indicated diagonals.