Normal sudoku rules apply. Clues outside the grid indicate the sums of runs of contiguous cells that must be shaded. The shaded runs must be separated by at least 1 non-shaded cell. The imposter has messed up this Japanese Sums Sudoku! The imposter changed SOME column/row clues to represent the runs of UNshaded cells instead of the shaded ones! And he even erased one of the clues (row 5)! All I remember is that there are less shaded cells than unshaded. Note: a row or column clue will only give you a clue about one type of cell: shaded or unshaded. There are no mixed clues within a column or row.