The numbers beside each row and above each column are the lengths of the filled blocks in that line, in order, with at least one gap between them.
Clue 3 1 on a 5-wide row: a run of three, a gap, then… the last cell must be the "1", so the fourth is empty. Marked ✕.
- Tap a cell to fill it. Tap again for an ✕ (a note that it is empty). Once more clears it.
- Switch the tool to ✕ to lay down notes quickly, or drag across a line to paint.
- A row or column clue turns green when that line is correct.
- Finish the whole picture first to win. ✕ marks do not matter — only the filled cells.
