How to play
Select the right numbers so that every row and every column adds up to the target sum shown on its edge.
Tap a number to select it; tap it again to unselect it. Only selected numbers count toward the sums. When a row or column reaches its target, its label turns gold. If a line's selected numbers add up to more than its target, the label turns red — you've selected one too many.
Turn on Exclude to tap tiles you've ruled out (or right-click a tile with a mouse) — it's just a tracking aid and doesn't affect the puzzle. Tiles in a completed row or column dim automatically.
You win when every row and column label is gold at once. Undo (or ⌘/Ctrl+Z) steps back through your moves.