1-9 appear in each row and column. Japanese Sums rules: The clues outside the grid indicate the sums of the contiguous runs found in that row or column that must be shaded. There must be at least one unshaded cell between runs. If a row or column is unclued, there is no shading in that row or column. Regions, which each contain 1-9 orthogonally connected, must be determined. Either all or no cells within a region are shaded. There is a 3x3 magic square (all 3-cell rows, columns and diagonals sum to the same number) hidden somewhere in the picture.