Make every row and column add up
Number Sums is a logic puzzle on a grid of numbers. Each row and each column has a target sum written at its edge, and you finish a level when every one of them is matched. The work is deciding which numbers count and which do not.
Controls
Click, or tap on a phone. The game has two modes: Select, to mark a cell that belongs in the sum, and Remove, to strike out a cell that does not.
Where to start a grid
Do not start in the middle. Start where the arithmetic leaves no choice:
A row whose target equals all its numbers added together — every cell in it counts, so select them all. A target that only one combination can reach — if a row needs 9 and holds 9, 4 and 6, only the 9 on its own adds up (4 + 6 makes 10), so the 9 stays and the other two go. A number bigger than its row's target can never be part of it, so remove it straight away.
Every cell you settle in a row also settles it in a column, so one forced row often unlocks the next. When nothing is forced, look at the column that crosses the cell you are unsure about.
How much there is
The game lists 5,000 levels, getting larger as you go. It is a long game to play in short sessions.
Facts on this page come from the game's own description and its GamePix page. The solving advice is ours.
