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. zenzaburo 00:13.11
2. beatrixwashere
115
00:16.13
3. Kukko
165
00:16.51
4. Diggy 00:17.07
5. geyik
207
00:17.88
6. SophieK
57
00:18.57
7. Dorice
265
00:18.66
8. a21737074481
173
00:18.87
9. Ontwikseltsaar
103
00:19.65
10. pipifax 00:19.83
11. Harry_Canyon
138
00:20.57
12. niqnna
18
00:21.03
13. Axiomatically_confus...
32
00:21.41
14. ScoutDad 00:24.53
15. grimmgirlfandom
169
00:26.00
16. Toksku 00:26.98
17. LordHedgie 00:28.19
18. KETJAK
37
00:30.20
19. monjo 00:30.41
20. peeps469
14
00:30.88
This Week
1. zenzaburo 00:13.11
2. SophieK
57
00:18.57
3. pipifax 00:19.83
4. Harry_Canyon
138
00:20.57
5. niqnna
18
00:21.30
6. ScoutDad 00:24.53
7. grimmgirlfandom
169
00:26.00
8. monjo 00:30.41
9. Barthos 00:32.09
10. Rickieman86 00:34.62
11. cbzqwq 00:35.07
12. ambiorix 00:38.66
13. Goochelaar
107
00:43.77
14. liuxiao 00:51.70
15. PaniOlga 00:51.78
16. SSJ4Silver 00:54.88
17. qzxxyyzw
7
01:00.81
18. chrispy
74
01:04.60
19. LordHedgie 01:06.74
20. Calle333 01:07.77
Today
1. zenzaburo 00:18.50
2. SophieK
57
00:18.57
3. cbzqwq 00:35.07
4. qzxxyyzw
7
01:00.81
5. Calle333 01:07.77
6. yngve 01:43.58
7.--- empty -----:--
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
00:10.40
2. mtanzer
140
00:12.14
3. sfumato
166
00:12.30
4. TashiroMiraki
221
00:12.95
5. Yeti
138
00:13.27
6. gtkrouwel
134
00:13.35
7. Oryn
171
00:13.36
8. vowels
216
00:14.15
9. sauceguardian
105
00:14.22
10. Arok
115
00:14.35
AO5
1. numbrr
310
00:11.18
2. sfumato
166
00:12.81
3. gtkrouwel
134
00:13.10
4. Yeti
138
00:13.68
5. TashiroMiraki
221
00:13.72
6. Oryn
171
00:13.82
7. mtanzer
140
00:14.07
8. qqwref
266
00:14.60
9. sauceguardian
105
00:14.79
10. Nick
217
00:15.32
AO12
1. numbrr
310
00:12.54
2. gtkrouwel
134
00:14.18
3. TashiroMiraki
221
00:14.87
3. sfumato
166
00:14.87
5. Yeti
138
00:15.50
6. mtanzer
140
00:16.17
7. sauceguardian
105
00:16.42
8. Oryn
171
00:16.44
9. qqwref
266
00:17.00
10. Sonar
82
00:17.17
Robots / programmatic solversinfo  
1.tlstyer
142
00:00.007
2.hum@b0t
91
00:00.160
3.cheyette00:00.258

* 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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