Normal sudoku rules apply. Numbers outside the grid show the total of the X number of cells, starting the OPPOSITE side of the grid, where X is the first cell next to the clue, so if r1 began with a 4, its last 4 cells would sum to 22.
Normal sudoku rules apply. Numbers outside the grid show the total of the X number of cells, starting the OPPOSITE side of the grid, where X is the first cell next to the clue, so if r1 began with a 4, its last 4 cells would sum to 22.