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

This Month
1. Yeti
127
00:57.84
2. TomGuo
150
00:59.30
3. mmmmtra 00:59.85
4. tt1029
106
01:03.42
5. zdz
90
01:08.41
6. Squid
47
01:14.33
7. Hachiman 01:18.29
8. highprime
123
01:22.31
9. TheET 01:22.36
10. Thrillhou 01:22.72
11. Quarterback7
109
01:23.31
12. jorekami
90
01:25.75
13. katrin0000 01:27.34
14. LemonSherbet 01:28.47
15. zyffr
20
01:31.39
16. DdBbon 01:31.60
17. wamfly
19
01:33.08
18. Twipsii 01:34.85
19. Jovess 01:38.90
20. stevethesquid
69
01:39.31
This Week
1. TomGuo
150
01:03.54
2. tt1029
106
01:06.03
3. zdz
90
01:08.41
4. Squid
47
01:24.54
5. LemonSherbet 01:28.47
6. TheET 01:28.56
7. zyffr
20
01:31.39
8. DdBbon 01:31.60
9. wamfly
19
01:33.08
10. Twipsii 01:34.85
11. Jovess 01:38.90
12. xxbh02jf 01:44.95
13. sue
46
01:54.11
14. tatiana maslova
17
01:55.03
15. Hashibrown 01:57.48
16. nbapip 01:58.15
17. cryptOakmont 02:26.07
18. bozyslaw67
64
02:31.05
19. CrlD
119
02:32.19
20. hiptopoker 02:43.46
Today
1. tt1029
106
01:09.67
2. zyffr
20
01:31.39
3. Jovess 01:38.90
4. tatiana maslova
17
01:55.03
5. wamfly
19
03:01.29
6. Gracexull
10
03:54.48
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
302
00:50.09
2. TashiroMiraki
217
00:51.08
3. 강일출
172
01:02.56
4. Mark M.
114
01:02.66
5. sfumato
166
01:02.97
6. Yeti
127
01:04.76
7. gtkrouwel
129
01:05.10
8. mtanzer
140
01:08.67
9. 2015YINJ02
170
01:09.95
10. Thomas Garner
169
01:10.08
AO5
1. numbrr
302
00:53.75
2. TashiroMiraki
217
00:53.76
3. Mark M.
114
01:05.59
4. 강일출
172
01:07.85
5. gtkrouwel
129
01:08.46
6. mtanzer
140
01:09.99
7. Yeti
127
01:10.08
8. Thomas Garner
169
01:12.16
9. Klunk
24
01:15.24
10. dxjonas
139
01:16.00
AO12
1. numbrr
302
01:10.81
2. TashiroMiraki
217
01:11.46
3. gtkrouwel
129
01:14.83
4. Yeti
127
01:21.79
5. Thomas Garner
169
01:23.14
6. 강일출
172
01:24.51
7. Mark M.
114
01:25.52
8. mtanzer
140
01:26.99
9. dxjonas
139
01:29.41
10. Moooon
116
01:34.35
Robots / programmatic solversinfo  
1.tlstyer
136
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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2025-11-30 16:44:34

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