Weighted-sum shading logic — free online or as a large-print book
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Shade cells so each row’s right clue = the sum of the COLUMN weights of its shaded cells, and each column’s bottom clue = the sum of the ROW weights of its shaded cells. Tap a cell to shade or clear it.
How Kakurasu works
Each column has a weight 1, 2, 3 … (left to right, shown across the top) and each row a weight 1, 2, 3 … (top to bottom, shown down the left). The clue on the right of a row is the sum of the column weights of the shaded cells in that row; the clue below a column is the sum of the row weights of the shaded cells in that column. Find the one shading that fits every clue — by pure logic.
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Prefer paper?
Large Print Kakurasu — 110 puzzles per volume (Easy to Hard), as a paperback (also in German).