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. gtkrouwel
137
00:42.04
2. tt1029
129
00:57.41
3. zenzaburo 01:07.95
4. Billo93 01:13.05
5. Jananana
54
01:23.14
6. lookchin 01:28.66
7. Oryn
180
01:38.29
8. Melinda Ainsworth
143
01:39.30
9. niqnna
18
01:43.72
10. kennethaw88
158
01:44.90
11. Amator 01:49.11
12. BeccaWorm
132
01:52.89
13. Jamwich
21
02:04.00
14. ojyojyojy
43
02:05.11
15. Dorice
271
02:06.62
16. PaniOlga 02:07.64
17. HackMan
123
02:08.54
18. AnonyMinor
86
02:11.55
19. baimouren
88
02:11.93
20. Praktisix
131
02:17.93
This Week
1. gtkrouwel
137
00:42.86
2. tt1029
129
01:03.67
3. zenzaburo 01:10.42
4. Melinda Ainsworth
143
01:39.30
5. Amator 01:53.35
6. Dorice
271
02:06.62
7. PaniOlga 02:10.52
8. déjà vu
18
02:23.59
9. MARTIN1979
101
02:29.12
10. miccos56 02:35.73
11. not2sleepy
80
02:54.76
12. niqnna
18
03:18.61
13. AnonyMinor
86
03:24.97
14. Praktisix
131
03:52.25
15. cowtown 04:32.24
16. Goochelaar
108
05:27.65
17. MatiZ1994
11
05:34.41
18. AlexisD
22
07:38.94
19. Emfine
70
15:45.34
20.--- empty -----:--
Today
1. Amator 02:15.82
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MO3
1. numbrr
321
00:46.10
2. TashiroMiraki
229
00:47.55
3. gtkrouwel
137
00:48.99
4. Yeti
141
00:55.46
5. sfumato
168
01:01.21
6. qqwref
266
01:05.62
7. Nick
217
01:07.31
8. tt1029
129
01:10.78
9. mtanzer
140
01:10.95
10. 戎慶一
73
01:11.62
AO5
1. numbrr
321
00:46.10
2. gtkrouwel
137
00:50.71
3. TashiroMiraki
229
00:51.06
4. Yeti
141
00:56.52
5. sfumato
168
01:08.37
6. mtanzer
140
01:11.61
7. tt1029
129
01:12.61
8. qqwref
266
01:13.56
9. summernight
236
01:14.94
10. 2015YINJ02
184
01:15.93
AO12
1. numbrr
321
00:55.85
2. gtkrouwel
137
00:56.02
3. TashiroMiraki
229
00:56.88
4. Yeti
141
01:09.44
5. summernight
236
01:19.65
6. qqwref
266
01:23.77
7. Oryn
180
01:24.66
8. mtanzer
140
01:25.21
9. sfumato
168
01:32.17
10. 2015YINJ02
184
01:33.71
Robots / programmatic solversinfo  
1.tlstyer
150
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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