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. ypw19
90
00:14.48
2. zenzaburo 00:15.24
3. Kukko
169
00:20.02
4. beatrixwashere
116
00:20.56
5. Ontwikseltsaar
103
00:20.86
6. Truth-or-Peace
133
00:22.15
7. LemonSherbet 00:24.33
8. niqnna
18
00:24.91
9. BeccaWorm
123
00:27.17
10. nerdvert
99
00:28.09
11. SophieK
57
00:28.84
12. ScoutDad 00:29.47
13. Jazka 00:30.43
14. ysh2020 00:34.40
15. qobi
235
00:34.49
16. jmk770 00:34.98
17. MARTIN1979
101
00:36.29
18. penguin0206 00:39.54
19. monjo 00:40.47
20. PaniOlga 00:46.50
This Week
1. zenzaburo 00:17.53
2. LemonSherbet 00:24.33
3. niqnna
18
00:27.75
4. Jazka 00:30.43
5. jmk770 00:34.98
6. nerdvert
99
00:36.43
7. penguin0206 00:39.54
8. monjo 00:40.47
9. ambiorix 00:53.14
10. LikeGazelle
21
00:57.62
11. EG0hun 01:29.23
12. tightlikerope 01:45.69
13. emeraldnight
5
02:06.84
14. CHENG123 02:33.81
15. Mountryside Index
5
03:01.52
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Today
1. zenzaburo 00:23.27
2. jmk770 00:34.98
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MO3
1. numbrr
312
00:11.07
2. mtanzer
140
00:13.41
3. gtkrouwel
134
00:14.04
4. TashiroMiraki
222
00:14.07
5. sfumato
166
00:15.17
6. Oryn
172
00:16.33
7. Yeti
138
00:16.95
8. Zenta
97
00:19.31
9. 2015YINJ02
178
00:19.38
10. ypw19
90
00:19.67
AO5
1. numbrr
312
00:12.09
2. gtkrouwel
134
00:13.18
3. TashiroMiraki
222
00:14.69
4. mtanzer
140
00:15.42
5. sfumato
166
00:15.52
6. Oryn
172
00:17.99
7. Yeti
138
00:18.45
8. ypw19
90
00:19.67
9. mmyama
79
00:20.09
10. qqwref
266
00:20.14
AO12
1. numbrr
312
00:15.43
2. gtkrouwel
134
00:16.27
3. mtanzer
140
00:17.29
4. TashiroMiraki
222
00:18.02
5. sfumato
166
00:20.39
6. Yeti
138
00:23.32
7. qqwref
266
00:23.33
8. Nick
217
00:24.51
9. summernight
232
00:24.76
10. Oryn
172
00:25.51
Robots / programmatic solversinfo  
1.tlstyer
143
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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