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 00:53.74
2. Yeti
141
00:54.34
3. tt1029
126
01:00.25
4. TomGuo
153
01:03.10
5. cryptOakmont 01:03.62
6. zenzaburo 01:03.81
7. Judaske
51
01:05.60
8. mmmmtra 01:05.70
9. Aysha
111
01:13.06
10. iovichulo413
54
01:14.17
11. highprime
145
01:16.64
12. Twipsii 01:16.77
13. Billo93 01:18.32
14. Hesper
87
01:19.42
15. KongeBob 01:20.16
16. Thrillhou
12
01:21.02
17. DdBbon 01:23.44
18. Squid
59
01:24.80
19. Jananana
51
01:36.29
20. ykykpyk 01:36.38
This Week
1. tt1029
126
01:03.81
2. mmmmtra 01:11.39
3. Aysha
111
01:13.06
4. Billo93 01:18.32
5. Hesper
87
01:19.42
6. highprime
145
01:19.45
7. iovichulo413
54
01:19.76
8. KongeBob 01:20.16
9. DdBbon 01:23.44
10. zenzaburo 01:25.89
11. Jananana
51
01:36.29
12. Thrillhou
12
01:36.94
13. xxbh02jf 01:37.06
14. EricLuo123
13
01:56.80
15. wamfly
21
02:02.06
16. HackMan
123
02:28.70
17. Dorice
269
02:36.87
18. bsk5941
93
02:40.84
19. PaniOlga 02:45.12
20. hiptopoker 02:52.92
Today
1. tt1029
126
01:03.81
2. KongeBob 01:20.16
3. zenzaburo 01:28.04
4. Jananana
51
01:50.75
5. Hesper
87
02:06.08
6. AzuReVaPouR 04:30.87
7. 999111 07:39.63
8. Kelizo
39
09:15.78
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
321
00:50.09
2. TashiroMiraki
228
00:51.08
3. 강일출
182
01:02.56
4. Mark M.
116
01:02.66
5. sfumato
168
01:02.97
6. Yeti
141
01:04.76
7. gtkrouwel
136
01:05.10
8. mtanzer
140
01:08.67
9. Thomas Garner
176
01:09.11
10. 2015YINJ02
181
01:09.95
AO5
1. numbrr
321
00:53.75
2. TashiroMiraki
228
00:53.76
3. Mark M.
116
01:05.59
4. 강일출
182
01:07.85
5. gtkrouwel
136
01:08.46
6. mtanzer
140
01:09.99
7. Yeti
141
01:10.08
8. Thomas Garner
176
01:12.16
9. Klunk
24
01:15.24
10. dxjonas
156
01:16.00
AO12
1. numbrr
321
01:02.65
2. TashiroMiraki
228
01:11.46
3. gtkrouwel
136
01:14.83
4. Yeti
141
01:21.79
5. Thomas Garner
176
01:23.14
6. 강일출
182
01:24.51
7. Mark M.
116
01:25.52
8. mtanzer
140
01:26.99
9. dxjonas
156
01:29.41
10. Moooon
126
01:34.07
Robots / programmatic solversinfo  
1.tlstyer
148
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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