206 puzzles

One Line Puzzles around Missing Squares

An interior missing square changes how a continuous line can move between nearby areas. These boards are selected from their actual layouts: each has at least one inactive square strictly inside the occupied area's bounding rectangle. Gaps cannot be crossed and are not part of the fill target.

A practical way to approach these boards

Follow the edges around a gap before drawing. Look for one-square-wide links between areas, then decide which area must be filled first. Closing both sides of a gap can leave an unfilled region cut off from the head, even when the head still has a legal move.

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.

One Line Puzzle level 4 opening diagram: 22 active squares, circle at row 4, column 3, diamond at row 4, column 6

Keep both sides connected

22 active squares · 21 verified moves · 3 gaps inside occupied bounds

Play level →LEVEL 05

One Line Puzzle level 5 opening diagram: 26 active squares, circle at row 3, column 4, diamond at row 5, column 3

Leave a way back

26 active squares · 25 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 06

One Line Puzzle level 6 opening diagram: 28 active squares, circle at row 2, column 4, diamond at row 3, column 6

Two ways across

28 active squares · 27 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 07

One Line Puzzle level 7 opening diagram: 28 active squares, circle at row 3, column 3, diamond at row 4, column 7

A narrow return

28 active squares · 27 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 08

One Line Puzzle level 8 opening diagram: 28 active squares, circle at row 4, column 4, diamond at row 6, column 7

Keep the bridge open

28 active squares · 27 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 09

One Line Puzzle level 9 opening diagram: 28 active squares, circle at row 4, column 7, diamond at row 6, column 6

Across the gap

28 active squares · 27 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 10

One Line Puzzle level 10 opening diagram: 28 active squares, circle at row 5, column 5, diamond at row 2, column 3

One last connection

28 active squares · 27 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 11

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

Thread the middle

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

Play level →LEVEL 12

One Line Puzzle level 12 opening diagram: 32 active squares, circle at row 5, column 3, diamond at row 6, column 7

Three open corners

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

Play level →LEVEL 13

One Line Puzzle level 13 opening diagram: 32 active squares, circle at row 6, column 4, diamond at row 5, column 6

Protect the crossing

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

Play level →LEVEL 14

One Line Puzzle level 14 opening diagram: 32 active squares, circle at row 4, column 3, diamond at row 6, column 4

Turn before the pocket

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

Play level →LEVEL 15

One Line Puzzle level 15 opening diagram: 32 active squares, circle at row 4, column 3, diamond at row 6, column 4

Room to return

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

Play level →LEVEL 16

One Line Puzzle level 16 opening diagram: 34 active squares, circle at row 4, column 6, diamond at row 7, column 4

Side by side

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

Play level →LEVEL 17

One Line Puzzle level 17 opening diagram: 34 active squares, circle at row 3, column 4, diamond at row 2, column 2

A winding passage

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

Play level →LEVEL 18

One Line Puzzle level 18 opening diagram: 34 active squares, circle at row 7, column 5, diamond at row 7, column 6

Save the inner turn

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

Play level →LEVEL 19

One Line Puzzle level 19 opening diagram: 34 active squares, circle at row 2, column 3, diamond at row 5, column 5

Through both halves

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

Play level →LEVEL 20

One Line Puzzle level 20 opening diagram: 34 active squares, circle at row 2, column 3, diamond at row 3, column 3

Leave the gate open

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

Play level →LEVEL 21

One Line Puzzle level 21 opening diagram: 38 active squares, circle at row 4, column 4, diamond at row 6, column 7

A wider crossing

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

Play level →LEVEL 22

One Line Puzzle level 22 opening diagram: 38 active squares, circle at row 4, column 5, diamond at row 7, column 3

Loops and links

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

Play level →LEVEL 23

One Line Puzzle level 23 opening diagram: 38 active squares, circle at row 2, column 7, diamond at row 4, column 4

Reach the far corner

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

Play level →LEVEL 24

One Line Puzzle level 24 opening diagram: 38 active squares, circle at row 4, column 7, diamond at row 3, column 5

Before the last turn

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

Play level →LEVEL 25

One Line Puzzle level 25 opening diagram: 38 active squares, circle at row 4, column 5, diamond at row 2, column 2

A path between rooms

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

Play level →LEVEL 26

One Line Puzzle level 26 opening diagram: 40 active squares, circle at row 7, column 6, diamond at row 4, column 6

Plan the return

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

Play level →LEVEL 27

One Line Puzzle level 27 opening diagram: 40 active squares, circle at row 5, column 4, diamond at row 5, column 5

Across the whole board

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

Play level →LEVEL 28

One Line Puzzle level 28 opening diagram: 40 active squares, circle at row 5, column 5, diamond at row 3, column 4

The remaining pocket

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

Play level →LEVEL 29

One Line Puzzle level 29 opening diagram: 40 active squares, circle at row 5, column 4, diamond at row 6, column 6

Hold the connection

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

Play level →LEVEL 30

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

One continuous journey

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

Play level →LEVEL 31

One Line Puzzle level 31 opening diagram: 40 active squares, circle at row 5, column 6, diamond at row 6, column 4

Between the pockets

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

Play level →LEVEL 32

One Line Puzzle level 32 opening diagram: 40 active squares, circle at row 4, column 2, diamond at row 3, column 4

A crossing to keep

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

Play level →LEVEL 33

One Line Puzzle level 33 opening diagram: 40 active squares, circle at row 3, column 8, diamond at row 5, column 7

Both sides of the gap

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

Play level →LEVEL 34

One Line Puzzle level 34 opening diagram: 40 active squares, circle at row 4, column 6, diamond at row 3, column 4

Return through the middle

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

Play level →LEVEL 35

One Line Puzzle level 35 opening diagram: 40 active squares, circle at row 4, column 5, diamond at row 5, column 7

One open passage

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

Play level →LEVEL 36

One Line Puzzle level 36 opening diagram: 42 active squares, circle at row 8, column 4, diamond at row 7, column 6

Seven missing squares

42 active squares · 41 verified moves · 7 gaps inside occupied bounds

Play level →LEVEL 37

One Line Puzzle level 37 opening diagram: 42 active squares, circle at row 3, column 7, diamond at row 5, column 6

Connections through the middle

42 active squares · 41 verified moves · 7 gaps inside occupied bounds

Play level →LEVEL 38

One Line Puzzle level 38 opening diagram: 42 active squares, circle at row 7, column 3, diamond at row 4, column 5

The inner connection

42 active squares · 41 verified moves · 7 gaps inside occupied bounds

Play level →LEVEL 39

One Line Puzzle level 39 opening diagram: 42 active squares, circle at row 4, column 2, diamond at row 3, column 8

Keep room to turn

42 active squares · 41 verified moves · 7 gaps inside occupied bounds

Play level →LEVEL 40

One Line Puzzle level 40 opening diagram: 42 active squares, circle at row 6, column 7, diamond at row 4, column 4

Links across the board

42 active squares · 41 verified moves · 7 gaps inside occupied bounds

Play level →LEVEL 41

One Line Puzzle level 41 opening diagram: 44 active squares, circle at row 7, column 3, diamond at row 5, column 4

The far-side pocket

44 active squares · 43 verified moves · 5 gaps inside occupied bounds

Play level →LEVEL 42

One Line Puzzle level 42 opening diagram: 44 active squares, circle at row 6, column 7, diamond at row 8, column 8

Thread two openings

44 active squares · 43 verified moves · 5 gaps inside occupied bounds

Play level →LEVEL 43

One Line Puzzle level 43 opening diagram: 44 active squares, circle at row 3, column 4, diamond at row 7, column 5

Across the broken grid

44 active squares · 43 verified moves · 5 gaps inside occupied bounds

Play level →LEVEL 44

One Line Puzzle level 44 opening diagram: 44 active squares, circle at row 3, column 8, diamond at row 4, column 8

A careful crossing

44 active squares · 43 verified moves · 5 gaps inside occupied bounds

Play level →LEVEL 45

One Line Puzzle level 45 opening diagram: 44 active squares, circle at row 4, column 8, diamond at row 7, column 6

The last open corner

44 active squares · 43 verified moves · 5 gaps inside occupied bounds

Play level →LEVEL 46

One Line Puzzle level 46 opening diagram: 46 active squares, circle at row 3, column 7, diamond at row 8, column 7

Space for a return

46 active squares · 45 verified moves · 3 gaps inside occupied bounds

Play level →LEVEL 47

One Line Puzzle level 47 opening diagram: 46 active squares, circle at row 7, column 3, diamond at row 5, column 8

The winding center

46 active squares · 45 verified moves · 3 gaps inside occupied bounds

Play level →LEVEL 48

One Line Puzzle level 48 opening diagram: 46 active squares, circle at row 2, column 6, diamond at row 7, column 8

Before the final stretch

46 active squares · 45 verified moves · 3 gaps inside occupied bounds

Play level →LEVEL 49

One Line Puzzle level 49 opening diagram: 46 active squares, circle at row 6, column 3, diamond at row 3, column 3

A narrow connection

46 active squares · 45 verified moves · 3 gaps inside occupied bounds

Play level →LEVEL 50

One Line Puzzle level 50 opening diagram: 46 active squares, circle at row 7, column 7, diamond at row 7, column 8

The other side

46 active squares · 45 verified moves · 3 gaps inside occupied bounds

Play level →LEVEL 51

One Line Puzzle level 51 opening diagram: 48 active squares, circle at row 4, column 6, diamond at row 4, column 5

Eight islands

48 active squares · 47 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 52

One Line Puzzle level 52 opening diagram: 48 active squares, circle at row 3, column 5, diamond at row 6, column 3

Connect the outer rooms

48 active squares · 47 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 53

One Line Puzzle level 53 opening diagram: 48 active squares, circle at row 7, column 6, diamond at row 8, column 2

A turn between gaps

48 active squares · 47 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 54

One Line Puzzle level 54 opening diagram: 48 active squares, circle at row 3, column 6, diamond at row 8, column 8

Keep a way through

48 active squares · 47 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 55

One Line Puzzle level 55 opening diagram: 48 active squares, circle at row 4, column 7, diamond at row 5, column 7

Keep the regions connected

48 active squares · 47 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 56

One Line Puzzle level 56 opening diagram: 50 active squares, circle at row 4, column 6, diamond at row 4, column 3

Across the whole canvas

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 57

One Line Puzzle level 57 opening diagram: 50 active squares, circle at row 8, column 5, diamond at row 5, column 5

A path around six gaps

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 58

One Line Puzzle level 58 opening diagram: 50 active squares, circle at row 5, column 5, diamond at row 8, column 7

Hold the middle open

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 59

One Line Puzzle level 59 opening diagram: 50 active squares, circle at row 6, column 3, diamond at row 3, column 5

Leave no pocket behind

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 60

One Line Puzzle level 60 opening diagram: 50 active squares, circle at row 7, column 8, diamond at row 7, column 3

One line to the finish

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 61

One Line Puzzle level 61 opening diagram: 50 active squares, circle at row 6, column 5, diamond at row 4, column 8

Across both open edges

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 62

One Line Puzzle level 62 opening diagram: 50 active squares, circle at row 7, column 2, diamond at row 6, column 6

Leave the middle connected

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 63

One Line Puzzle level 63 opening diagram: 50 active squares, circle at row 7, column 5, diamond at row 4, column 7

An exit for each pocket

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 64

One Line Puzzle level 64 opening diagram: 50 active squares, circle at row 7, column 4, diamond at row 2, column 4

Around the broken border

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 65

One Line Puzzle level 65 opening diagram: 50 active squares, circle at row 5, column 6, diamond at row 4, column 6

Meet at the inner turn

50 active squares · 49 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 66

One Line Puzzle level 66 opening diagram: 52 active squares, circle at row 8, column 6, diamond at row 8, column 7

Three links to preserve

52 active squares · 51 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 67

One Line Puzzle level 67 opening diagram: 52 active squares, circle at row 4, column 4, diamond at row 6, column 7

Return beside the diamond

52 active squares · 51 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 68

One Line Puzzle level 68 opening diagram: 52 active squares, circle at row 4, column 6, diamond at row 7, column 2

The long outside passage

52 active squares · 51 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 69

One Line Puzzle level 69 opening diagram: 52 active squares, circle at row 7, column 5, diamond at row 4, column 3

Separate paths to connect

52 active squares · 51 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 70

One Line Puzzle level 70 opening diagram: 52 active squares, circle at row 7, column 4, diamond at row 4, column 4

One link still open

52 active squares · 51 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 71

One Line Puzzle level 71 opening diagram: 54 active squares, circle at row 6, column 4, diamond at row 5, column 8

Across the narrow middle

54 active squares · 53 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 72

One Line Puzzle level 72 opening diagram: 54 active squares, circle at row 3, column 2, diamond at row 5, column 3

Connections across the open regions

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 73

One Line Puzzle level 73 opening diagram: 54 active squares, circle at row 3, column 1, diamond at row 3, column 8

Keep the far edge free

54 active squares · 53 verified moves · 2 gaps inside occupied bounds

Play level →LEVEL 74

One Line Puzzle level 74 opening diagram: 54 active squares, circle at row 6, column 6, diamond at row 2, column 5

Keep the inner crossings open

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 76

One Line Puzzle level 76 opening diagram: 52 active squares, circle at row 5, column 6, diamond at row 7, column 7

Eight rows to connect

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 77

One Line Puzzle level 77 opening diagram: 52 active squares, circle at row 7, column 7, diamond at row 1, column 2

A passage between islands

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 78

One Line Puzzle level 78 opening diagram: 52 active squares, circle at row 7, column 2, diamond at row 2, column 6

Both sides need an exit

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 79

One Line Puzzle level 79 opening diagram: 52 active squares, circle at row 6, column 8, diamond at row 4, column 5

Return through the open gap

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 80

One Line Puzzle level 80 opening diagram: 52 active squares, circle at row 4, column 5, diamond at row 2, column 8

Protect the central link

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 81

One Line Puzzle level 81 opening diagram: 54 active squares, circle at row 7, column 5, diamond at row 2, column 5

A route across the gaps

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 82

One Line Puzzle level 82 opening diagram: 54 active squares, circle at row 4, column 4, diamond at row 5, column 2

Leave a way around

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 83

One Line Puzzle level 83 opening diagram: 54 active squares, circle at row 4, column 7, diamond at row 8, column 8

The inner edge first

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 84

One Line Puzzle level 84 opening diagram: 54 active squares, circle at row 3, column 7, diamond at row 8, column 5

Follow the open border

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 85

One Line Puzzle level 85 opening diagram: 54 active squares, circle at row 4, column 8, diamond at row 8, column 3

A link to the far side

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 86

One Line Puzzle level 86 opening diagram: 56 active squares, circle at row 8, column 2, diamond at row 4, column 5

Across the widest board

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 87

One Line Puzzle level 87 opening diagram: 56 active squares, circle at row 4, column 5, diamond at row 5, column 7

Thread the last passages

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 88

One Line Puzzle level 88 opening diagram: 56 active squares, circle at row 3, column 2, diamond at row 7, column 5

Keep the diamond reachable

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 89

One Line Puzzle level 89 opening diagram: 56 active squares, circle at row 7, column 5, diamond at row 3, column 2

The final pocket to fill

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 90

One Line Puzzle level 90 opening diagram: 56 active squares, circle at row 7, column 3, diamond at row 5, column 4

One continuous return

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 91

One Line Puzzle level 91 opening diagram: 52 active squares, circle at row 7, column 8, diamond at row 2, column 4

Read the scattered spaces

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 92

One Line Puzzle level 92 opening diagram: 52 active squares, circle at row 7, column 4, diamond at row 7, column 3

Keep two passages open

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 93

One Line Puzzle level 93 opening diagram: 52 active squares, circle at row 4, column 4, diamond at row 1, column 2

Across the upper pocket

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 94

One Line Puzzle level 94 opening diagram: 52 active squares, circle at row 2, column 5, diamond at row 7, column 5

A link around the centre

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 95

One Line Puzzle level 95 opening diagram: 52 active squares, circle at row 2, column 3, diamond at row 5, column 3

Return beside the outer gap

52 active squares · 51 verified moves · 12 gaps inside occupied bounds

Play level →LEVEL 96

One Line Puzzle level 96 opening diagram: 54 active squares, circle at row 3, column 2, diamond at row 8, column 2

An exit from each side

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 97

One Line Puzzle level 97 opening diagram: 54 active squares, circle at row 7, column 3, diamond at row 6, column 5

Join the divided edges

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 98

One Line Puzzle level 98 opening diagram: 54 active squares, circle at row 6, column 2, diamond at row 3, column 6

Through the middle passage

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 99

One Line Puzzle level 99 opening diagram: 54 active squares, circle at row 2, column 5, diamond at row 5, column 3

Leave the corner connected

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 100

One Line Puzzle level 100 opening diagram: 54 active squares, circle at row 5, column 7, diamond at row 4, column 5

Past the narrow opening

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 101

One Line Puzzle level 101 opening diagram: 56 active squares, circle at row 2, column 7, diamond at row 4, column 6

Weave around both spaces

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 102

One Line Puzzle level 102 opening diagram: 56 active squares, circle at row 7, column 7, diamond at row 1, column 4

The far edge still waits

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 103

One Line Puzzle level 103 opening diagram: 56 active squares, circle at row 7, column 5, diamond at row 5, column 4

An unfinished inner turn

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 104

One Line Puzzle level 104 opening diagram: 56 active squares, circle at row 8, column 7, diamond at row 3, column 3

Across the quiet border

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 105

One Line Puzzle level 105 opening diagram: 56 active squares, circle at row 2, column 8, diamond at row 3, column 4

Connect the remaining sides

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 106

One Line Puzzle level 106 opening diagram: 54 active squares, circle at row 7, column 2, diamond at row 6, column 8

A different way around

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 107

One Line Puzzle level 107 opening diagram: 54 active squares, circle at row 2, column 3, diamond at row 6, column 6

Two pockets to revisit

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 108

One Line Puzzle level 108 opening diagram: 54 active squares, circle at row 6, column 4, diamond at row 1, column 2

Cross the open centre

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 109

One Line Puzzle level 109 opening diagram: 54 active squares, circle at row 2, column 6, diamond at row 4, column 3

Keep the lower passage

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 110

One Line Puzzle level 110 opening diagram: 54 active squares, circle at row 4, column 4, diamond at row 6, column 1

Return across the upper edge

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 111

One Line Puzzle level 111 opening diagram: 56 active squares, circle at row 1, column 3, diamond at row 5, column 2

The route between gaps

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 112

One Line Puzzle level 112 opening diagram: 56 active squares, circle at row 7, column 5, diamond at row 6, column 1

Leave the inner door open

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 113

One Line Puzzle level 113 opening diagram: 56 active squares, circle at row 5, column 1, diamond at row 7, column 4

One more region to join

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 114

One Line Puzzle level 114 opening diagram: 56 active squares, circle at row 6, column 6, diamond at row 6, column 5

Around the final bend

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 115

One Line Puzzle level 115 opening diagram: 56 active squares, circle at row 1, column 7, diamond at row 2, column 5

Both edges need a link

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 116

One Line Puzzle level 116 opening diagram: 58 active squares, circle at row 7, column 6, diamond at row 4, column 4

Read the widest shape

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 117

One Line Puzzle level 117 opening diagram: 58 active squares, circle at row 2, column 4, diamond at row 2, column 5

An exit beyond the corner

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 118

One Line Puzzle level 118 opening diagram: 58 active squares, circle at row 8, column 7, diamond at row 1, column 5

Thread the outer connections

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 119

One Line Puzzle level 119 opening diagram: 58 active squares, circle at row 3, column 1, diamond at row 1, column 4

Keep one passage for last

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 120

One Line Puzzle level 120 opening diagram: 58 active squares, circle at row 4, column 6, diamond at row 4, column 7

A fourth continuous journey

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 121

One Line Puzzle level 121 opening diagram: 54 active squares, circle at row 5, column 5, diamond at row 6, column 1

Leave the inner passage

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 122

One Line Puzzle level 122 opening diagram: 54 active squares, circle at row 2, column 4, diamond at row 4, column 3

An open way to the centre

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 123

One Line Puzzle level 123 opening diagram: 54 active squares, circle at row 2, column 6, diamond at row 6, column 3

Return around the side pocket

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 124

One Line Puzzle level 124 opening diagram: 54 active squares, circle at row 5, column 3, diamond at row 6, column 1

The border still connects

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 125

One Line Puzzle level 125 opening diagram: 54 active squares, circle at row 2, column 8, diamond at row 4, column 3

Keep the inner square reachable

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 126

One Line Puzzle level 126 opening diagram: 56 active squares, circle at row 8, column 4, diamond at row 2, column 1

Between three open regions

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 127

One Line Puzzle level 127 opening diagram: 56 active squares, circle at row 6, column 6, diamond at row 4, column 1

Read the edge before crossing

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 128

One Line Puzzle level 128 opening diagram: 56 active squares, circle at row 2, column 2, diamond at row 4, column 7

A passage beneath the gap

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 129

One Line Puzzle level 129 opening diagram: 56 active squares, circle at row 4, column 4, diamond at row 1, column 2

Join the two far corners

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 130

One Line Puzzle level 130 opening diagram: 56 active squares, circle at row 6, column 7, diamond at row 2, column 8

Return through the middle

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 131

One Line Puzzle level 131 opening diagram: 58 active squares, circle at row 7, column 6, diamond at row 4, column 6

Along the wider border

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 132

One Line Puzzle level 132 opening diagram: 58 active squares, circle at row 3, column 5, diamond at row 1, column 8

Leave room for the last turn

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 133

One Line Puzzle level 133 opening diagram: 58 active squares, circle at row 6, column 4, diamond at row 1, column 2

Connect the farthest pocket

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 134

One Line Puzzle level 134 opening diagram: 58 active squares, circle at row 3, column 4, diamond at row 6, column 6

The open edge comes later

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 135

One Line Puzzle level 135 opening diagram: 58 active squares, circle at row 8, column 7, diamond at row 8, column 4

One region at a time

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 136

One Line Puzzle level 136 opening diagram: 54 active squares, circle at row 6, column 6, diamond at row 8, column 5

A new order through the gaps

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 137

One Line Puzzle level 137 opening diagram: 54 active squares, circle at row 7, column 3, diamond at row 3, column 8

Keep the short link open

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 138

One Line Puzzle level 138 opening diagram: 54 active squares, circle at row 7, column 7, diamond at row 7, column 8

Across the split middle

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 139

One Line Puzzle level 139 opening diagram: 54 active squares, circle at row 5, column 4, diamond at row 6, column 4

Return beside the narrow edge

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 140

One Line Puzzle level 140 opening diagram: 54 active squares, circle at row 5, column 8, diamond at row 4, column 8

The pocket beyond the bend

54 active squares · 53 verified moves · 10 gaps inside occupied bounds

Play level →LEVEL 141

One Line Puzzle level 141 opening diagram: 56 active squares, circle at row 4, column 5, diamond at row 4, column 8

A path around the empty centre

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 142

One Line Puzzle level 142 opening diagram: 56 active squares, circle at row 8, column 3, diamond at row 3, column 3

Join both sides before leaving

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 143

One Line Puzzle level 143 opening diagram: 56 active squares, circle at row 3, column 7, diamond at row 5, column 6

Save the inner passage

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 144

One Line Puzzle level 144 opening diagram: 56 active squares, circle at row 1, column 3, diamond at row 5, column 6

The far corner needs a return

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 145

One Line Puzzle level 145 opening diagram: 56 active squares, circle at row 5, column 4, diamond at row 3, column 3

Connect the lower edge last

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 146

One Line Puzzle level 146 opening diagram: 58 active squares, circle at row 6, column 4, diamond at row 6, column 5

Through the final open regions

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 147

One Line Puzzle level 147 opening diagram: 58 active squares, circle at row 4, column 5, diamond at row 7, column 7

A return beside the diamond

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 148

One Line Puzzle level 148 opening diagram: 58 active squares, circle at row 2, column 1, diamond at row 4, column 6

Leave the last connection free

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 149

One Line Puzzle level 149 opening diagram: 58 active squares, circle at row 7, column 2, diamond at row 1, column 5

The fifth round takes shape

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 150

One Line Puzzle level 150 opening diagram: 58 active squares, circle at row 8, column 2, diamond at row 5, column 6

One line through every region

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 151

One Line Puzzle level 151 opening diagram: 56 active squares, circle at row 6, column 1, diamond at row 8, column 4

Keep the upper passage connected

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 152

One Line Puzzle level 152 opening diagram: 56 active squares, circle at row 6, column 4, diamond at row 4, column 5

A return around the small gap

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 153

One Line Puzzle level 153 opening diagram: 56 active squares, circle at row 2, column 2, diamond at row 7, column 4

The side region waits

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 154

One Line Puzzle level 154 opening diagram: 56 active squares, circle at row 5, column 5, diamond at row 7, column 6

Across the open square

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 155

One Line Puzzle level 155 opening diagram: 56 active squares, circle at row 2, column 3, diamond at row 1, column 5

Bring the edges together

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 156

One Line Puzzle level 156 opening diagram: 58 active squares, circle at row 4, column 3, diamond at row 3, column 5

Between the inward turns

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 157

One Line Puzzle level 157 opening diagram: 58 active squares, circle at row 6, column 3, diamond at row 8, column 4

Keep a route to the far side

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 158

One Line Puzzle level 158 opening diagram: 58 active squares, circle at row 2, column 3, diamond at row 3, column 5

The pocket beside the circle

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 159

One Line Puzzle level 159 opening diagram: 58 active squares, circle at row 7, column 3, diamond at row 4, column 3

Link the upper and lower regions

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 160

One Line Puzzle level 160 opening diagram: 58 active squares, circle at row 4, column 4, diamond at row 3, column 6

A passage through the centre

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 161

One Line Puzzle level 161 opening diagram: 60 active squares, circle at row 1, column 3, diamond at row 5, column 4

Read the nearly full board

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 162

One Line Puzzle level 162 opening diagram: 60 active squares, circle at row 2, column 7, diamond at row 7, column 7

An opening around four gaps

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 163

One Line Puzzle level 163 opening diagram: 60 active squares, circle at row 7, column 2, diamond at row 4, column 4

Leave the corner connected

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 164

One Line Puzzle level 164 opening diagram: 60 active squares, circle at row 7, column 3, diamond at row 5, column 8

The long way to the diamond

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 165

One Line Puzzle level 165 opening diagram: 60 active squares, circle at row 1, column 6, diamond at row 4, column 8

Return before closing the edge

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 166

One Line Puzzle level 166 opening diagram: 56 active squares, circle at row 3, column 8, diamond at row 8, column 8

New gaps along the border

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 167

One Line Puzzle level 167 opening diagram: 56 active squares, circle at row 7, column 7, diamond at row 2, column 3

Keep both exits available

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 168

One Line Puzzle level 168 opening diagram: 56 active squares, circle at row 2, column 8, diamond at row 3, column 6

Through the opposite region

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 169

One Line Puzzle level 169 opening diagram: 56 active squares, circle at row 2, column 1, diamond at row 3, column 1

Around the interrupted middle

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 170

One Line Puzzle level 170 opening diagram: 56 active squares, circle at row 4, column 6, diamond at row 4, column 1

The outer connection remains

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 171

One Line Puzzle level 171 opening diagram: 58 active squares, circle at row 6, column 3, diamond at row 1, column 1

Connect the narrow regions

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 172

One Line Puzzle level 172 opening diagram: 58 active squares, circle at row 7, column 7, diamond at row 1, column 8

A turn beside the last pocket

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 173

One Line Puzzle level 173 opening diagram: 58 active squares, circle at row 6, column 4, diamond at row 1, column 8

Leave a link across the board

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 174

One Line Puzzle level 174 opening diagram: 58 active squares, circle at row 7, column 7, diamond at row 8, column 7

The centre connects both sides

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 175

One Line Puzzle level 175 opening diagram: 58 active squares, circle at row 4, column 3, diamond at row 4, column 4

Reach the far edge and return

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 176

One Line Puzzle level 176 opening diagram: 60 active squares, circle at row 7, column 7, diamond at row 5, column 4

Across the final four gaps

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 177

One Line Puzzle level 177 opening diagram: 60 active squares, circle at row 4, column 6, diamond at row 5, column 6

Keep the inward passage open

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 178

One Line Puzzle level 178 opening diagram: 60 active squares, circle at row 5, column 2, diamond at row 5, column 3

One last return to the border

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 179

One Line Puzzle level 179 opening diagram: 60 active squares, circle at row 4, column 1, diamond at row 8, column 2

The sixth round comes together

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 180

One Line Puzzle level 180 opening diagram: 60 active squares, circle at row 4, column 4, diamond at row 5, column 4

Every region in one line

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 181

One Line Puzzle level 181 opening diagram: 58 active squares, circle at row 2, column 4, diamond at row 5, column 8

A new order through the open board

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 182

One Line Puzzle level 182 opening diagram: 58 active squares, circle at row 3, column 1, diamond at row 2, column 3

Keep a way around the inner gap

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 183

One Line Puzzle level 183 opening diagram: 58 active squares, circle at row 3, column 3, diamond at row 3, column 6

The far region stays connected

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 184

One Line Puzzle level 184 opening diagram: 58 active squares, circle at row 7, column 3, diamond at row 3, column 6

Join the borders before the finish

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 185

One Line Puzzle level 185 opening diagram: 58 active squares, circle at row 1, column 4, diamond at row 2, column 6

Return between the open edges

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 186

One Line Puzzle level 186 opening diagram: 56 active squares, circle at row 7, column 5, diamond at row 8, column 5

Read the breaks in the grid

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 187

One Line Puzzle level 187 opening diagram: 56 active squares, circle at row 1, column 7, diamond at row 1, column 8

Leave both regions reachable

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 188

One Line Puzzle level 188 opening diagram: 56 active squares, circle at row 8, column 2, diamond at row 7, column 2

Across the border and back

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 189

One Line Puzzle level 189 opening diagram: 56 active squares, circle at row 1, column 2, diamond at row 8, column 4

Keep the small pocket open

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 190

One Line Puzzle level 190 opening diagram: 56 active squares, circle at row 7, column 2, diamond at row 3, column 5

A route between the gaps

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 191

One Line Puzzle level 191 opening diagram: 60 active squares, circle at row 2, column 7, diamond at row 6, column 6

Four gaps and a longer line

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 192

One Line Puzzle level 192 opening diagram: 60 active squares, circle at row 1, column 4, diamond at row 5, column 3

Connect the nearly full square

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 193

One Line Puzzle level 193 opening diagram: 60 active squares, circle at row 6, column 7, diamond at row 6, column 2

A turn before the final region

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 194

One Line Puzzle level 194 opening diagram: 60 active squares, circle at row 6, column 5, diamond at row 7, column 3

Leave space for the return

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 195

One Line Puzzle level 195 opening diagram: 60 active squares, circle at row 1, column 3, diamond at row 1, column 4

Bring the last regions together

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 196

One Line Puzzle level 196 opening diagram: 58 active squares, circle at row 6, column 5, diamond at row 5, column 7

Around a different centre

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 197

One Line Puzzle level 197 opening diagram: 58 active squares, circle at row 7, column 3, diamond at row 7, column 6

The open side needs a return

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 198

One Line Puzzle level 198 opening diagram: 58 active squares, circle at row 4, column 6, diamond at row 5, column 8

Keep the distant edge reachable

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 199

One Line Puzzle level 199 opening diagram: 58 active squares, circle at row 7, column 7, diamond at row 6, column 5

Across the middle connection

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 200

One Line Puzzle level 200 opening diagram: 58 active squares, circle at row 8, column 5, diamond at row 3, column 1

A passage for the remaining squares

58 active squares · 57 verified moves · 6 gaps inside occupied bounds

Play level →LEVEL 201

One Line Puzzle level 201 opening diagram: 56 active squares, circle at row 5, column 1, diamond at row 6, column 7

Between the interrupted rows

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 202

One Line Puzzle level 202 opening diagram: 56 active squares, circle at row 3, column 6, diamond at row 1, column 1

The next region can wait

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 203

One Line Puzzle level 203 opening diagram: 56 active squares, circle at row 1, column 6, diamond at row 3, column 1

Keep a link beside the gap

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 204

One Line Puzzle level 204 opening diagram: 56 active squares, circle at row 6, column 4, diamond at row 3, column 6

A return through the outer region

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 205

One Line Puzzle level 205 opening diagram: 56 active squares, circle at row 8, column 3, diamond at row 8, column 4

Connect the two sides in order

56 active squares · 55 verified moves · 8 gaps inside occupied bounds

Play level →LEVEL 206

One Line Puzzle level 206 opening diagram: 60 active squares, circle at row 1, column 5, diamond at row 3, column 4

One line around the last gaps

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 207

One Line Puzzle level 207 opening diagram: 60 active squares, circle at row 4, column 1, diamond at row 3, column 7

The far border comes next

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 208

One Line Puzzle level 208 opening diagram: 60 active squares, circle at row 2, column 7, diamond at row 7, column 7

Return through the open middle

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 209

One Line Puzzle level 209 opening diagram: 60 active squares, circle at row 1, column 7, diamond at row 7, column 8

The seventh round connects

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →LEVEL 210

One Line Puzzle level 210 opening diagram: 60 active squares, circle at row 7, column 3, diamond at row 4, column 7

All regions on a single line

60 active squares · 59 verified moves · 4 gaps inside occupied bounds

Play level →

Questions about these puzzles

Do I need to cover the grey squares?

No. Only active white squares count. Inactive squares are obstacles and cannot be entered.

Are these boards selected just because they appear later?

No. Membership is computed from each board's active-cell coordinates and the existence of an interior missing square.

Can I cross my line to reach the other side?

No. Each active square is visited once in a completed route. Only immediate reverse tracing is allowed, so older visited squares cannot be crossed.