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. zenzaburo 00:15.20
2. niqnna
18
00:18.64
3. crema
268
00:22.01
4. LemonSherbet 00:24.33
5. Truth-or-Peace
135
00:24.73
6. Thrillhou
5
00:26.55
7. grimmgirlfandom
169
00:28.97
8. ScoutDad 00:29.47
9. Jazka 00:30.43
10. jmk770 00:34.98
11. nerdvert
100
00:35.08
12. Jamwich
21
00:35.14
13. kanon
56
00:36.64
14. Otenkiya
60
00:38.87
15. penguin0206 00:39.54
16. AnonyMinor
79
00:40.44
17. monjo 00:40.47
18. MARTIN1979
101
00:42.23
19. Daehyeok Kwon
51
00:48.65
20. LikeGazelle
23
00:50.84
This Week
1. zenzaburo 00:17.45
2. niqnna
18
00:21.44
3. crema
268
00:22.01
4. Truth-or-Peace
135
00:24.73
5. Thrillhou
5
00:26.55
6. grimmgirlfandom
169
00:28.97
7. Jamwich
21
00:35.14
8. Otenkiya
60
00:38.87
9. AnonyMinor
79
00:40.44
10. penguin0206 00:46.78
11. cowtown 00:51.52
12. xilli 01:07.24
13. Odenzon
29
01:34.34
14. p.阿久
12
02:07.01
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
Today
1. zenzaburo 00:19.42
2. niqnna
18
00:24.79
3. Jamwich
21
00:35.14
4. Otenkiya
60
00:38.87
5. cowtown 01:18.34
6.--- empty -----:--
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
315
00:11.07
2. mtanzer
140
00:13.41
3. gtkrouwel
135
00:14.04
4. TashiroMiraki
224
00:14.07
5. sfumato
167
00:15.17
6. Oryn
173
00:16.33
7. Yeti
139
00:16.95
8. Zenta
98
00:19.31
9. 2015YINJ02
180
00:19.38
10. ypw19
91
00:19.67
AO5
1. numbrr
315
00:12.09
2. gtkrouwel
135
00:13.18
3. TashiroMiraki
224
00:14.69
4. mtanzer
140
00:15.42
5. sfumato
167
00:15.52
6. Oryn
173
00:17.99
7. Yeti
139
00:18.45
8. ypw19
91
00:19.67
9. mmyama
79
00:20.09
10. qqwref
266
00:20.14
AO12
1. numbrr
315
00:15.43
2. gtkrouwel
135
00:16.27
3. mtanzer
140
00:17.29
4. TashiroMiraki
224
00:18.02
5. sfumato
167
00:20.39
6. Yeti
139
00:23.32
7. qqwref
266
00:23.33
8. Nick
217
00:24.51
9. summernight
232
00:24.76
10. Oryn
173
00:25.51
Robots / programmatic solversinfo  
1.tlstyer
144
00:00.007
2.hum@b0t
91
00:00.164
3.cheyette00:00.356

* 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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