Normal sudoku rules apply. Clues outside the grid indicate the sum of the first X digits from the Nth cell from that side, where X is the digit in the Nth cell and N is the digit in the first cell from that side.
Normal sudoku rules apply. Clues outside the grid indicate the sum of the first X digits from the Nth cell from that side, where X is the digit in the Nth cell and N is the digit in the first cell from that side.