20 puzzles

Medium One Line Puzzles

The Medium campaign band covers levels eleven through thirty. These boards use 32 to 40 active squares and place gaps between areas of the route. A locally convenient turn can isolate an unfilled pocket, so the order in which you visit the areas matters. Difficulty is an editorial campaign estimate.

A practical way to approach these boards

Inspect each narrow connection before crossing it. Ask which unfilled area still needs that passage and whether you will be able to leave the area you are entering. Save a connection to the diamond until the rest of the board is covered.

Rules for every board

Move orthogonally from the circle, cover all active squares, and reach the diamond last. Backtracking and retries are free. When browser storage is available, the board below each level introduction shares saved progress with the trial.

LEVEL 11One Line Puzzle level 11 opening diagram: 32 active squares, circle at row 5, column 3, diamond at row 4, column 5Thread the middle

32 active squares · 31 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 12One Line Puzzle level 12 opening diagram: 32 active squares, circle at row 5, column 3, diamond at row 6, column 7Three open corners

32 active squares · 31 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 13One Line Puzzle level 13 opening diagram: 32 active squares, circle at row 6, column 4, diamond at row 5, column 6Protect the crossing

32 active squares · 31 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 14One Line Puzzle level 14 opening diagram: 32 active squares, circle at row 4, column 3, diamond at row 6, column 4Turn before the pocket

32 active squares · 31 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 15One Line Puzzle level 15 opening diagram: 32 active squares, circle at row 4, column 3, diamond at row 6, column 4Room to return

32 active squares · 31 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 16One Line Puzzle level 16 opening diagram: 34 active squares, circle at row 4, column 6, diamond at row 7, column 4Side by side

34 active squares · 33 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 17One Line Puzzle level 17 opening diagram: 34 active squares, circle at row 3, column 4, diamond at row 2, column 2A winding passage

34 active squares · 33 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 18One Line Puzzle level 18 opening diagram: 34 active squares, circle at row 7, column 5, diamond at row 7, column 6Save the inner turn

34 active squares · 33 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 19One Line Puzzle level 19 opening diagram: 34 active squares, circle at row 2, column 3, diamond at row 5, column 5Through both halves

34 active squares · 33 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 20One Line Puzzle level 20 opening diagram: 34 active squares, circle at row 2, column 3, diamond at row 3, column 3Leave the gate open

34 active squares · 33 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 21One Line Puzzle level 21 opening diagram: 38 active squares, circle at row 4, column 4, diamond at row 6, column 7A wider crossing

38 active squares · 37 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 22One Line Puzzle level 22 opening diagram: 38 active squares, circle at row 4, column 5, diamond at row 7, column 3Loops and links

38 active squares · 37 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 23One Line Puzzle level 23 opening diagram: 38 active squares, circle at row 2, column 7, diamond at row 4, column 4Reach the far corner

38 active squares · 37 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 24One Line Puzzle level 24 opening diagram: 38 active squares, circle at row 4, column 7, diamond at row 3, column 5Before the last turn

38 active squares · 37 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 25One Line Puzzle level 25 opening diagram: 38 active squares, circle at row 4, column 5, diamond at row 2, column 2A path between rooms

38 active squares · 37 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 26One Line Puzzle level 26 opening diagram: 40 active squares, circle at row 7, column 6, diamond at row 4, column 6Plan the return

40 active squares · 39 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 27One Line Puzzle level 27 opening diagram: 40 active squares, circle at row 5, column 4, diamond at row 5, column 5Across the whole board

40 active squares · 39 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 28One Line Puzzle level 28 opening diagram: 40 active squares, circle at row 5, column 5, diamond at row 3, column 4The remaining pocket

40 active squares · 39 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 29One Line Puzzle level 29 opening diagram: 40 active squares, circle at row 5, column 4, diamond at row 6, column 6Hold the connection

40 active squares · 39 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 30One Line Puzzle level 30 opening diagram: 40 active squares, circle at row 3, column 7, diamond at row 2, column 7One continuous journey

40 active squares · 39 verified moves · 2 gaps inside occupied bounds

Play level →

Questions about these puzzles

Does a longer path always mean a harder puzzle?

No. Square count describes route length. The arrangement of gaps, endpoints and connections also affects the choices you need to make.

Can I return to an unfinished board?

Yes. The map restores that board's saved route on this device when browser storage is available. Each board has its own saved path.