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 00:05.60
2. Axiomatically_confus...
32
00:06.42
3. beatrixwashere
115
00:06.52
4. yyyyyyyejin
112
00:06.56
5. Ontwikseltsaar
103
00:07.00
6. Kukko
165
00:07.40
7. niqnna
18
00:07.51
8. highprime
138
00:07.55
9. bird
27
00:08.02
10. pipifax 00:09.76
11. a21737074481
174
00:09.84
12. frog3
8
00:09.87
13. Harry_Canyon
138
00:10.16
14. 2021zhao07
23
00:10.26
15. NiceJake
23
00:10.42
16. CitricBase
9
00:10.94
17. grimmgirlfandom
169
00:11.28
18. Strider500
107
00:11.85
19. Dorice
265
00:11.88
20. waggonra 00:11.96
This Week
1. zenzaburo 00:06.54
2. yyyyyyyejin
112
00:06.56
3. highprime
138
00:07.55
4. niqnna
18
00:08.33
5. NiceJake
23
00:10.42
6. AnonyMinor
77
00:11.96
7. pipifax 00:12.51
8. chenrui
13
00:12.53
9. Byzcysg 00:12.85
10. monjo 00:12.90
11. josefelia 00:16.58
12. bingxi 00:19.45
13. PaniOlga 00:21.47
14. EG0hun 00:21.97
15. chrispy
75
00:22.39
16. sqw0tb7zc
10
00:24.90
17. HollowKing 00:26.44
18. tightlikerope 00:30.35
19. Elevatorkat 00:39.99
20. brerp
10
00:44.95
Today
1. zenzaburo 00:08.29
2. niqnna
18
00:10.91
3. Byzcysg 00:12.85
4. josefelia 00:16.58
5. chrispy
75
00:24.10
6. tightlikerope 00:30.35
7. Uthor 18d 03:21:15.90
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
310
00:04.21
2. Yeti
138
00:05.19
3. vowels
216
00:05.21
4. mtanzer
140
00:05.22
5. Arok
115
00:05.24
6. gtkrouwel
134
00:05.36
7. sfumato
166
00:05.44
8. sauceguardian
105
00:05.81
9. TashiroMiraki
221
00:05.91
10. PuzzleMaestro
90
00:05.94
AO5
1. numbrr
310
00:04.76
2. gtkrouwel
134
00:05.49
3. Yeti
138
00:05.87
4. mtanzer
140
00:05.96
5. sfumato
166
00:06.02
6. Arok
115
00:06.06
7. TashiroMiraki
221
00:06.18
8. sauceguardian
105
00:06.20
9. vowels
216
00:06.31
10. jaybrainer
258
00:06.33
AO12
1. numbrr
310
00:05.38
2. Yeti
138
00:06.20
3. gtkrouwel
134
00:06.29
4. sfumato
166
00:06.43
5. mtanzer
140
00:06.94
5. Arok
115
00:06.94
7. TashiroMiraki
221
00:07.08
8. sauceguardian
105
00:07.10
9. qqwref
266
00:07.20
10. Douglas Shamlin Jr.
718
00:07.34
Robots / programmatic solversinfo  
1.tlstyer
142
00:00.006
2.cheyette00:00.141
3.hum@b0t
91
00:00.160

* 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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