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. tt1029
118
00:54.90
2. zenzaburo 00:55.11
3. TomGuo
152
00:56.61
4. lookchin 01:11.23
5. keehaag
167
01:25.32
6. Dorice
265
01:26.78
7. Ontwikseltsaar
103
01:32.09
8. Froerto3301
42
01:35.14
9. ypw19
90
01:36.40
10. Melinda Ainsworth
125
01:49.67
11. SophieK
57
01:52.76
12. Praktisix
124
02:01.99
13. niqnna
18
02:07.55
14. JanJaeger 02:12.32
15. fidaa 02:16.19
16. Amator 02:16.48
17. aferk
70
02:26.77
18. beatrixwashere
115
02:29.54
19. Jiangxq
8
02:35.90
20. Rhododendron
150
02:41.79
This Week
1. zenzaburo 00:55.11
2. TomGuo
152
00:56.61
3. tt1029
118
00:56.82
4. lookchin 01:11.23
5. keehaag
167
01:25.32
6. SophieK
57
01:52.76
7. Dorice
265
01:55.63
8. Melinda Ainsworth
125
02:05.08
9. JanJaeger 02:12.32
10. fidaa 02:16.19
11. Praktisix
124
02:34.44
12. Amator 02:36.30
13. niqnna
18
02:42.09
14. AnonyMinor
77
02:50.22
15. peeps469
14
03:02.39
16. pokosuk
40
04:09.19
17. DarkPhoenix
28
05:18.49
18. PaniOlga 05:37.09
19. tightlikerope 06:37.58
20. emeraldnight
3
07:28.81
Today
1. zenzaburo 00:55.11
2. lookchin 01:11.23
3. tt1029
118
01:11.66
4. keehaag
167
01:38.63
5. AnonyMinor
77
02:50.22
6. fidaa 04:03.31
7. tightlikerope 09:27.54
8.--- empty -----:--
9.--- empty -----:--
10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
MO3
1. numbrr
310
00:46.10
2. TashiroMiraki
221
00:47.55
3. gtkrouwel
134
00:48.99
4. sfumato
166
01:01.21
5. qqwref
266
01:05.62
6. Yeti
138
01:06.28
7. Nick
217
01:07.31
8. mtanzer
140
01:10.95
9. tt1029
118
01:11.41
10. 2015YINJ02
178
01:12.11
AO5
1. numbrr
310
00:46.10
2. TashiroMiraki
221
00:51.06
3. gtkrouwel
134
00:52.43
4. Yeti
138
01:07.43
5. sfumato
166
01:08.37
6. mtanzer
140
01:11.61
7. tt1029
118
01:12.63
8. qqwref
266
01:13.56
9. summernight
231
01:14.94
10. 2015YINJ02
178
01:15.93
AO12
1. numbrr
310
00:55.85
2. gtkrouwel
134
00:56.02
3. TashiroMiraki
221
00:56.88
4. summernight
231
01:19.65
5. qqwref
266
01:23.77
6. Oryn
171
01:24.66
7. mtanzer
140
01:25.21
8. Yeti
138
01:31.17
9. sfumato
166
01:32.17
10. 2015YINJ02
178
01:33.71
Robots / programmatic solversinfo  
1.tlstyer
142
00:00.011
2.hum@b0t
91
00:00.163
3.cheyette00:02.504

* 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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