Light Line

Light Line is a one-stroke fill puzzle. Each stage is a small maze of empty squares, and the challenge is to fill every one of them with a single touch, drawing a line of light that passes through the whole grid without missing a square.

The difficulty sits in the route rather than the controls. A grid can usually be entered from several places, but only some starting points let the line reach every square without trapping itself in a dead end. Corners and narrow corridors are where most attempts go wrong, because a square with only one open neighbour has to be the start or the end of the line.

The game invites you to try harder stages as much as possible, and the pleasure it promises is a simple one: the moment the last blank is filled perfectly. The tags list it as a time-killer and a link puzzle, and it fits that role well, since each stage is a compact problem you can look at, solve and leave behind.

1. Look at the shape of the maze and its empty squares.
2. Choose a starting square, ideally a dead end or corner.
3. Draw the light line through the maze in a single touch.
4. Fill every empty square to complete the stage.

Any square with only one open neighbour must be where the line starts or finishes, so find those first.