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. TomGuo
152
00:52.55
2. tt1029
119
01:01.82
3. Squid
56
01:04.31
4. zenzaburo 01:04.97
5. highprime
139
01:17.25
6. iovichulo413
51
01:17.72
7. cryptOakmont 01:18.19
8. Thrillhou 01:18.38
9. Twipsii 01:20.49
10. Changanlouli
46
01:20.72
11. DdBbon 01:20.78
12. keehaag
169
01:21.90
13. TheET 01:28.14
14. jonasb
50
01:32.12
15. Candyman 01:34.62
16. bonelessmoth 01:35.22
17. Laura Järvinen
54
01:38.04
18. wamfly
21
01:39.90
19. bbbbbbbbbbbb 01:44.14
20. wldnekz1 01:44.71
This Week
1. TomGuo
152
01:01.71
2. tt1029
119
01:06.30
3. zenzaburo 01:11.45
4. iovichulo413
51
01:17.72
5. cryptOakmont 01:20.01
6. Twipsii 01:20.49
7. DdBbon 01:20.78
8. keehaag
169
01:21.90
9. Squid
56
01:22.84
10. TheET 01:28.14
11. Thrillhou 01:29.15
12. jonasb
50
01:32.12
13. highprime
139
01:34.59
14. Laura Järvinen
54
01:38.04
15. bbbbbbbbbbbb 01:44.14
16. wldnekz1 01:44.71
17. erichiro 01:46.64
18. bonelessmoth 01:48.67
19. lynda 01:49.45
20. wamfly
21
01:49.65
Today
1. tt1029
119
01:06.30
2. cryptOakmont 01:20.01
3. jonasb
50
01:32.12
4. bbbbbbbbbbbb 01:44.14
5. Gigiw
84
02:36.59
6. peeps469
18
02:36.65
7. Yuiseleya 03:15.10
8. highprime
139
03:32.51
9. 999111 04:06.89
10. Strider500
107
04:19.18
11. Barthos 04:35.98
12. NanogramFreak 05:22.90
13. tightlikerope 07:33.11
14.--- empty -----:--
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
MO3
1. numbrr
311
00:50.09
2. TashiroMiraki
222
00:51.08
3. 강일출
178
01:02.56
4. Mark M.
114
01:02.66
5. sfumato
166
01:02.97
6. Yeti
138
01:04.76
7. gtkrouwel
134
01:05.10
8. mtanzer
140
01:08.67
9. 2015YINJ02
178
01:09.95
10. Thomas Garner
173
01:10.08
AO5
1. numbrr
311
00:53.75
2. TashiroMiraki
222
00:53.76
3. Mark M.
114
01:05.59
4. 강일출
178
01:07.85
5. gtkrouwel
134
01:08.46
6. mtanzer
140
01:09.99
7. Yeti
138
01:10.08
8. Thomas Garner
173
01:12.16
9. Klunk
24
01:15.24
10. dxjonas
149
01:16.00
AO12
1. numbrr
311
01:10.81
2. TashiroMiraki
222
01:11.46
3. gtkrouwel
134
01:14.83
4. Yeti
138
01:21.79
5. Thomas Garner
173
01:23.14
6. 강일출
178
01:24.51
7. Mark M.
114
01:25.52
8. mtanzer
140
01:26.99
9. dxjonas
149
01:29.41
10. Moooon
124
01:34.07
Robots / programmatic solversinfo  
1.tlstyer
142
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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