Each number tells you the length of a filled run in that row or column. Separate runs with at least one empty square.

Choose Fill for a solid square or Cross for an empty one. Drag across squares to mark a run. Tap a marked square again to clear it.

Hint marks only squares that every remaining arrangement of a row or column agrees on. A small dot marks a fixed starting square.

The direction pad moves the cursor; A fills a square and B crosses it. Use arrow keys to move and Space to mark. Press X to switch between Fill and Cross. Your progress saves on this device.

View work opens the original project at any time.