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. TomGuo
150
00:59.91
2. zdz
90
01:00.41
3. tt1029
108
01:01.97
4. mmmmtra 01:05.73
5. zyffr
20
01:12.23
6. Billo93 01:13.61
7. Squid
49
01:14.33
8. TheET 01:14.88
9. Hachiman 01:15.35
10. cryptOakmont 01:15.47
11. Thrillhou 01:22.72
12. Twipsii 01:25.52
13. Jovess 01:28.39
14. LemonSherbet 01:28.47
15. DdBbon 01:31.60
16. tatiana maslova
17
01:32.32
17. wamfly
20
01:33.08
18. iovichulo413
48
01:35.17
19. Freakazoyd
81
01:40.64
20. Exalmer
28
01:43.78
This Week
1. tt1029
108
01:01.97
2. mmmmtra 01:05.73
3. TomGuo
150
01:10.93
4. Hachiman 01:15.35
5. cryptOakmont 01:15.47
6. Thrillhou 01:23.17
7. zyffr
20
01:25.11
8. Jovess 01:28.39
9. Squid
49
01:39.11
10. wamfly
20
01:40.10
11. DdBbon 01:40.40
12. Exalmer
28
01:43.78
13. erichiro 01:49.61
14. katrin0000 01:49.76
15. KWLUNA
14
02:01.70
16. Cerine 02:07.85
17. Kimberly Fath
12
02:20.34
18. AnonyMinor
67
02:21.60
19. Linie
15
02:23.84
20. Froerto3301
28
02:36.10
Today
1. tt1029
108
01:04.42
2. KWLUNA
14
02:31.45
3. Gigiw
70
03:02.16
4. HackMan
118
05:31.39
5.--- empty -----:--
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10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
15.--- empty -----:--
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20.--- empty -----:--
MO3
1. numbrr
303
00:50.09
2. TashiroMiraki
217
00:51.08
3. 강일출
173
01:02.56
4. Mark M.
114
01:02.66
5. sfumato
166
01:02.97
6. Yeti
131
01:04.76
7. gtkrouwel
130
01:05.10
8. mtanzer
140
01:08.67
9. 2015YINJ02
171
01:09.95
10. Thomas Garner
170
01:10.08
AO5
1. numbrr
303
00:53.75
2. TashiroMiraki
217
00:53.76
3. Mark M.
114
01:05.59
4. 강일출
173
01:07.85
5. gtkrouwel
130
01:08.46
6. mtanzer
140
01:09.99
7. Yeti
131
01:10.08
8. Thomas Garner
170
01:12.16
9. Klunk
24
01:15.24
10. dxjonas
140
01:16.00
AO12
1. numbrr
303
01:10.81
2. TashiroMiraki
217
01:11.46
3. gtkrouwel
130
01:14.83
4. Yeti
131
01:21.79
5. Thomas Garner
170
01:23.14
6. 강일출
173
01:24.51
7. Mark M.
114
01:25.52
8. mtanzer
140
01:26.99
9. dxjonas
140
01:29.41
10. Moooon
118
01:34.35
Robots / programmatic solversinfo  
1.tlstyer
137
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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2025-12-20 18:04:41

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