Light Up


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Light Up (Akari) is a logic puzzle with simple rules and challenging solutions.

The rules are simple.Light Up is played on a rectangular grid. The grid has both black cells and white cells in it. The objective is to place light bulbs on the grid so that every white square is lit. A cell is illuminated by a light bulb if they're in the same row or column, and if there are no black cells between them. Also, no light bulb may illuminate another light bulb.
Some of the black cells have numbers in them. A number in a black cell indicates how many light bulbs share an edge with that cell.
Left click a square to place a light bulb. Right click to mark with X.

Video Tutorial
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Light Up


7x7 Easy Light Up | 7x7 Normal Light Up | 7x7 Hard Light Up | 10x10 Easy Light Up | 10x10 Normal Light Up | 10x10 Hard Light Up | 14x14 Easy Light Up | 14x14 Normal Light Up | 14x14 Hard Light Up | 25x25 Easy Light Up | 25x25 Normal Light Up | 25x25 Hard Light Up

New Puzzle
This Month
1. Arok
115
00:02.26
2. Freakazoyd
88
00:02.51
3. Axiomatically_confus...
32
00:02.67
3. nacho
45
00:02.67
5. frog3
8
00:02.71
6. zenzaburo 00:03.07
7. Ontwikseltsaar
103
00:03.21
8. jatloe12345
8
00:03.29
9. PeeinPotty 00:03.34
10. Piroska9
73
00:03.35
11. Konrad H
8
00:03.44
11. Kukko
165
00:03.44
13. highprime
137
00:03.47
14. niqnna
18
00:03.53
15. _seek3r
7
00:03.81
16. monjo 00:03.94
17. BeccaWorm
123
00:03.99
18. bird
25
00:04.00
18. Skeltic 00:04.00
20. puzzlingpatzer
91
00:04.01
This Week
1. zenzaburo 00:03.30
2. highprime
137
00:03.47
3. niqnna
18
00:03.53
4. _seek3r
7
00:03.81
5. BeccaWorm
123
00:03.99
6. puzzlingpatzer
91
00:04.01
7. cbzqwq 00:04.14
8. Pineapple1 00:04.46
9. Elevatorkat 00:04.56
10. Piroska9
73
00:04.59
11. DrLeiknar 00:04.63
12. fidaa 00:04.67
13. brerp
7
00:04.97
14. sorga
22
00:05.44
15. analili 00:05.47
16. ysh2020 00:05.56
17. yumido05 00:05.62
18. CQI
5
00:05.87
19. effek05
16
00:05.92
20. Viniciusav
6
00:06.03
Today
1. zenzaburo 00:03.36
2. niqnna
18
00:03.53
3. puzzlingpatzer
91
00:04.13
4. Elevatorkat 00:05.42
5. HollowKing 00:06.06
6. Viniciusav
6
00:06.75
7. brerp
7
00:06.93
8. Angelika9 00:07.86
9. commonera2k26
3
00:08.14
10. kdu
224
00:08.39
11. EG0hun 00:09.21
12. waggonra 00:12.09
13. sqw0tb7zc
7
00:19.52
14. Laika
13
00:29.87
15. chrispy
75
00:40.83
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
MO3
1. jaybrainer
257
00:01.82
2. numbrr
310
00:02.18
3. vowels
216
00:02.19
4. Arok
115
00:02.20
5. Yeti
138
00:02.28
6. sfumato
166
00:02.50
6. mtanzer
140
00:02.50
8. BingBongBob
108
00:02.53
9. qqwref
266
00:02.55
10. SkyBean1201
113
00:02.59
AO5
1. jaybrainer
257
00:01.97
2. numbrr
310
00:02.28
3. vowels
216
00:02.33
4. Yeti
138
00:02.35
5. Arok
115
00:02.36
6. Douglas Shamlin Jr.
718
00:02.58
7. sfumato
166
00:02.59
8. SkyBean1201
113
00:02.61
9. mtanzer
140
00:02.63
10. sauceguardian
105
00:02.67
AO12
1. jaybrainer
257
00:02.44
2. numbrr
310
00:02.60
3. vowels
216
00:02.67
4. Yeti
138
00:02.72
5. Arok
115
00:02.90
6. sfumato
166
00:02.98
7. Douglas Shamlin Jr.
718
00:03.00
8. mtanzer
140
00:03.09
9. sauceguardian
105
00:03.18
10. PuzzleMaestro
90
00:03.25
Robots / programmatic solversinfo  
1.tlstyer
142
00:00.006
2.cheyette00:00.109
3.hum@b0t
91
00:00.158

* MO3 - Mean of 3. The average of 3 consecutive times.
AO5 - Average of 5. The average of 5 consecutive times ignoring the highest and the lowest.
AO12 - Average of 12. The average of 12 consecutive times ignoring the highest and the lowest.
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