Sumline: Cross Sums
- Developer
- Zarocer
- Published
- Oct 5, 2026
- Technology
- HTML5
- Devices
- PC, Mobile
- Orientation
- Adaptive
- Players
- 1
About the game
A browser adaptation by Zarocer.
Fill each white cell with a digit from 1–9 to match the clue sums, without repeating a digit in a run. Choose a difficulty or a daily puzzle, with visible combinations, hints and local progress.
Controls
Click or tap a square or tile to play. Use the game controls to undo or restart.
Cross the possibilities of two runs
Digits 1–9 cannot repeat within one run. Two cells summing to 3 must contain 1 and 2, in either order. Their crossing down runs decide the order. A cell shared by that run and a two-cell run summing to 4 must be 1, because the latter run uses 1 and 3.
Explore combinations uses the visible sums and your other entries; it does not look up the puzzle solution. An incorrect entry can therefore remove a valid possibility from that panel. When no candidate remains, review your entries and use Undo or notes before asking for a revealed cell.
How to play
Select a light square and enter a digit from 1 to 9. The clue at the left is the sum of the across run; the clue above is the sum of the down run.
Modes and local progress
Sumline is a cross sums puzzle you can solve at your own pace. Choose from three board sizes, use notes to explore possibilities, and return for a date based daily challenge.
ZAROCER opens this build in English. Progress and records stay in this browser when storage is available. Use native continuation controls after reloading. Clearing site data can remove saves. Pause, Theater and Fullscreen preserve one game instance.
Sumline: Cross Sums gameplay screenshots
