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. ypw19
90
00:14.43
2. zenzaburo 00:16.21
3. Ontwikseltsaar
103
00:21.08
4. niqnna
18
00:27.43
5. jonasb
49
00:28.67
6. Nanoulefou 00:32.73
7. beatrixwashere
115
00:33.82
8. AnonyMinor
77
00:34.13
9. maxmoor 00:40.11
10. Axiomatically_confus...
32
00:40.87
11. LordHedgie 00:47.06
12. SophieK
57
00:47.08
13. Dorice
265
00:49.17
14. monjo 01:02.76
15. Ryong L
80
01:04.36
16. guizmoo 01:05.22
17. punkhead 01:08.28
18. Corallystarfish
54
01:08.87
19. Kenolo353
120
01:19.31
20. xilli 01:22.95
This Week
1. zenzaburo 00:18.76
2. niqnna
18
00:27.43
3. SophieK
57
00:47.08
4. guizmoo 01:05.22
5. Corallystarfish
54
01:08.87
6. emeraldnight
4
01:25.97
7. llmt9
90
01:34.53
8. tightlikerope 01:39.20
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Today
1. zenzaburo 00:26.70
2. niqnna
18
00:27.43
3. Corallystarfish
54
01:08.87
4. tightlikerope 02:10.56
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6.--- empty -----:--
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MO3
1. numbrr
310
00:12.77
2. TashiroMiraki
221
00:14.96
3. gtkrouwel
134
00:16.28
4. Klunk
24
00:17.36
5. mtanzer
140
00:18.21
6. sfumato
166
00:20.43
7. Yeti
138
00:20.45
8. Nick
217
00:21.19
9. goodman15
61
00:21.64
10. mmyama
79
00:23.64
AO5
1. numbrr
310
00:14.36
2. TashiroMiraki
221
00:15.81
3. gtkrouwel
134
00:16.52
4. mtanzer
140
00:19.33
5. Yeti
138
00:19.59
6. sfumato
166
00:22.39
7. Nick
217
00:23.23
8. goodman15
61
00:24.61
9. Oryn
171
00:25.09
10. Yonatan Yarhi
72
00:25.89
AO12
1. numbrr
310
00:17.12
2. TashiroMiraki
221
00:17.29
3. gtkrouwel
134
00:19.99
4. Yeti
138
00:25.01
5. goodman15
61
00:27.90
6. Oryn
171
00:28.67
7. mtanzer
140
00:29.15
8. qqwref
266
00:29.59
9. Yonatan Yarhi
72
00:30.12
10. summernight
231
00:32.05
Robots / programmatic solversinfo  
1.tlstyer
142
00:00.008
2.hum@b0t
91
00:00.165
3.cheyette00:00.239

* 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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