Sum Path
From each circled target, draw a path through neighbouring numbers that adds up to it exactly. Paths never cross, and every square must be used.
The rules
- 1Read the targets
Each target sits on the grid. A path starts on it.
- 2Draw a path
Drag from a target through adjacent squares. The running total shows as you go.
- 3Use every square
The puzzle is solved when every square belongs to a path and every path matches its target.
Controls
- Mouse / touch
- Drag from a target to draw; drag back to shorten.
- Keyboard
- Arrows move, Space extends the path, Backspace retracts.
Tips
- Big numbers have few homes.
- Corners have only two neighbours — decide them first.
Every square must be used, so the last path is forced by the ones before it.
Each puzzle is a grid of numbers and a set of targets. Draw a path from each target through neighbouring numbers so that they sum exactly to it, using every square once.
Common questions
How does Sum Path work?
Each target number sits on the grid. You drag a path from it through neighbouring squares so the numbers along the way add up to exactly that target, and every square on the grid ends up on some path.
Is there always exactly one solution?
Yes. Because every square must be used, the paths constrain each other: the last path is forced by the ones before it, so the answer can be deduced rather than guessed.
Is Sum Path good for practising mental arithmetic?
It is built for it. Short additions under mild time pressure, with a running total shown as you drag, so every step gives immediate feedback.
Can I play past Sum Path puzzles?
Yes. The archive keeps every daily since launch. Old puzzles are playable for fun but do not count towards streaks or the leaderboard.