How to play

The numbers say how many squares are filled in a row, and in what order. Work them out and a picture appears.

• A clue of 4 2 means a block of four filled squares, then at least one gap, then a block of two — in that order, somewhere along the line.
• Use Mark empty for squares you have ruled out. Those crosses are what let you pin the blocks down, so use them freely.
• Tap a square again to clear it. Drag to paint a run — the drag locks to a single row or column so it stays neat. On a desktop, right-click marks empty without switching modes.
• A clue fades once its line is finished and correct. Heavier grid lines every five squares help you count.
• Every puzzle can be reasoned out line by line — you never need to guess.

Where to start

• Look for clues that nearly fill their line. In a row of 10, a clue of 8 must cover the middle six squares whichever end it starts from.
• The same overlap trick works with several blocks: add the runs plus one gap between each, and anything left over is your wiggle room.
• A clue of 0 means the whole line is empty. Cross it all out.
• Once a block is complete, cross the squares at both ends — they cannot be part of it.
• Stuck? Hint finds the next square logic settles, and names the row or column that proves it.