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. DarkChamp 00:52.63
2. Yeti
140
00:54.34
3. tt1029
123
00:56.05
4. TomGuo
153
01:01.05
5. zenzaburo 01:01.46
6. Squid
59
01:04.27
7. Thrillhou
6
01:05.36
8. mmmmtra 01:13.55
9. DdBbon 01:13.81
10. highprime
143
01:16.64
11. cryptOakmont 01:18.13
12. Candyman 01:21.99
13. jonasb
53
01:22.71
14. Judaske
38
01:28.60
15. EricLuo123
10
01:30.21
16. Changanlouli
54
01:31.66
17. kanon
59
01:35.13
18. Laura Järvinen
65
01:36.83
19. bbbbbbbbbbbb 01:41.02
20. Jananana
47
01:41.87
This Week
1. DarkChamp 00:52.63
2. Yeti
140
00:54.34
3. tt1029
123
00:56.05
4. zenzaburo 01:08.34
5. highprime
143
01:16.64
6. Thrillhou
6
01:29.58
7. EricLuo123
10
01:30.21
8. cryptOakmont 01:31.26
9. Jananana
47
01:41.87
10. chmurka 01:42.36
11. Dust14
93
01:51.95
12. ykykpyk 01:55.29
13. wamfly
21
01:55.78
14. Hesper
84
01:57.57
15. tanbofan 02:02.28
16. niqnna
18
02:09.61
17. Cerine 02:22.09
18. Gigiw
90
02:22.39
19. kanon
59
02:29.84
20. ksbkdksgsg 02:32.13
Today
1. tt1029
123
01:07.27
2. zenzaburo 01:21.68
3. Cerine 02:22.09
4. linluo
9
03:27.66
5. 999111 04:18.30
6. Gigiw
90
21:30:45.35
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
317
00:50.09
2. TashiroMiraki
226
00:51.08
3. 강일출
180
01:02.56
4. Mark M.
115
01:02.66
5. sfumato
167
01:02.97
6. Yeti
140
01:04.76
7. gtkrouwel
135
01:05.10
8. mtanzer
140
01:08.67
9. Thomas Garner
175
01:09.11
10. 2015YINJ02
181
01:09.95
AO5
1. numbrr
317
00:53.75
2. TashiroMiraki
226
00:53.76
3. Mark M.
115
01:05.59
4. 강일출
180
01:07.85
5. gtkrouwel
135
01:08.46
6. mtanzer
140
01:09.99
7. Yeti
140
01:10.08
8. Thomas Garner
175
01:12.16
9. Klunk
24
01:15.24
10. dxjonas
154
01:16.00
AO12
1. numbrr
317
01:02.65
2. TashiroMiraki
226
01:11.46
3. gtkrouwel
135
01:14.83
4. Yeti
140
01:21.79
5. Thomas Garner
175
01:23.14
6. 강일출
180
01:24.51
7. Mark M.
115
01:25.52
8. mtanzer
140
01:26.99
9. dxjonas
154
01:29.41
10. Moooon
125
01:34.07
Robots / programmatic solversinfo  
1.tlstyer
147
00:00.014
2.hum@b0t
91
00:00.169
3.preciousmouse
74
00:01.075

* 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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