The numbers beside each row and above each column list the runs of filled cells in that line, in order, with at least one empty cell between runs. Fill the grid so every line matches its clues.
Every puzzle can be solved by reasoning about one line at a time — no guessing — and has exactly one solution. Today's puzzle is the same for everyone on the same day.
Tap or drag to fill. Switch to Cross (or right-click, or press X) to mark cells you know are empty. Tapping a marked cell clears it; a drag never overwrites cells that are already marked.
With Count mistakes on, filling an empty cell turns it into a cross and adds a mistake. Crosses never count against you.
Hint fixes a wrong fill or reveals a missing one — you get three per puzzle. Clues fade when their line is complete. Best time is kept per size. Puzzles save automatically.
Keyboard: arrow keys move, Enter or Space paints in the current mode, X crosses, Backspace clears.