Find the right balance.
- Use every tile exactly once. Choose a number in the bank, then a cell.
- The sum of every row and column must reach the target at its edge. The “current / target” display follows your arrangement.
- If you see a dashed diagonal ↘, its sum must also match. Fixed tiles with a dot cannot move.
- To move a tile, select it and then another cell. Tiles in occupied cells swap places. A new tile from the bank returns the displaced one to the bank.
Keyboard: Tab and Enter select controls. Arrow keys move through the grid or bank. Keys 1–9 select a movable tile, Escape cancels selection, and Delete returns the tile in the focused cell to the bank.
✓ means a full and correct sum; ! means an incorrect full sum or a target already exceeded. An incomplete sum is marked ·, even if it already equals the target. A hint first shows a suggested move; apply it separately. You can undo hints and restarts too.