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Index Sums (909)
Other names: Kakurasu
Instruction:
Each cell in the grid has a row number (the small numbers to the right of the grid) and a column number (the small numbers below the grid). Shade in some cells, leaving the other cells empty. Each large number above the grid represents the sums of the column numbers of the shaded cells in that column. Each large number to the left of the grid represents the sums of the row numbers of the shaded cells in that row.