Number Sums is an arithmetic logic puzzle where you select numbers so each row and column matches its target sum. The game is played on rectangular grids from easy 5×4 boards up to challenging 7×7 layouts. Use low hints to eliminate impossible numbers, high hints to spot must-select numbers, and intersections to refine your deductions. If you enjoy number puzzles, Number Sums is a great alternative to games like Kakuro and Futoshiki.
Number Sums
The objective in Number Sums is to select the correct combination of numbers so that the total in each row and each column matches its given hint.
Number Sums is played on a rectangular grid. Available sizes vary by difficulty:
Each row has a hint to its left, and each column has a hint at the top. These indicate the target sum for the selected numbers in that row or column.
Select numbers in the grid so that:
Clicking a number selects it. Right-click a number to erase it, or click a selected number to erase it. Clicking an erased number makes it appear again.
When a row or column’s sum matches its hint, the hint turns green. Note that a green hint doesn’t mean that the correct numbers were selected. Other combinations might also satisfy the hint.
Number Sums has similarities with Sumplete. If you enjoy this game, you may also like Kakuro, Futoshiki, and other logic puzzles that mix deduction with arithmetic reasoning.
Number Sums can be played in all modern browsers, on all device types (desktop, tablet, mobile), and on all operating systems (Windows, macOS, Linux, Android, iOS, ...).
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