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 00:02.78
2. niqnna
18
 00:03.73
3. Piroska9
76
 00:04.04
4. Noridice
169
 00:04.72
5. avit
18
 00:05.24
6. PaniOlga 00:05.72
7. hppkss
16
 00:05.79
8. kennethaw88
159
 00:06.11
9. haddekk
6
 00:06.38
10. name
28
 00:06.41
11. papachan 00:06.79
12. tsukishiro21
15
 00:06.86
13. hydrosanda
22
 00:07.54
14. miccos56 00:08.76
15. EG0hun 00:08.91
16. Lovrenac 00:09.10
17. Leci
7
 00:10.27
18. ojyojyojy
46
 00:10.43
19. Hugo
8
 00:10.79
20. HackMan
124
 00:10.83
This Week
1. zenzaburo 00:02.78
2. niqnna
18
 00:03.73
3. Piroska9
76
 00:05.51
4. haddekk
6
 00:06.38
5. tsukishiro21
15
 00:06.86
6. Lovrenac 00:09.10
7. Leci
7
 00:10.27
8. ojyojyojy
46
 00:10.43
9. HackMan
124
 00:10.83
10. Courtchan12189 00:12.21
11. Emfine
77
 00:12.45
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Today
1. niqnna
18
 00:05.24
2. Piroska9
76
 00:05.51
3. Lovrenac 00:09.10
4.--- empty -----:--
5.--- empty -----:--
6.--- empty -----:--
7.--- empty -----:--
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MO3
1. numbrr
321
 00:02.41
2. jaybrainer
273
 00:02.52
3. vowels
216
 00:02.71
4. Arok
115
 00:02.86
5. Yeti
142
 00:02.89
6. mtanzer
140
 00:03.06
6. Douglas Shamlin Jr.
722
 00:03.06
8. 2015YINJ02
186
 00:03.15
9. gtkrouwel
138
 00:03.18
10. nabi
92
 00:03.21
AO5
1. numbrr
321
 00:02.62
2. jaybrainer
273
 00:02.75
3. vowels
216
 00:03.02
4. Douglas Shamlin Jr.
722
 00:03.09
5. Yeti
142
 00:03.20
6. Arok
115
 00:03.23
7. mtanzer
140
 00:03.25
7. nabi
92
 00:03.25
9. 2015YINJ02
186
 00:03.46
10. TashiroMiraki
230
 00:03.59
AO12
1. numbrr
321
 00:03.28
2. jaybrainer
273
 00:03.30
3. Yeti
142
 00:03.69
4. vowels
216
 00:03.83
5. mtanzer
140
 00:03.89
6. 2015YINJ02
186
 00:03.93
7. Arok
115
 00:04.12
8. gtkrouwel
138
 00:04.27
9. Douglas Shamlin Jr.
722
 00:04.52
10. sfumato
168
 00:04.54
Robots / programmatic solversinfo  
1.tlstyer
151
00:00.007
2.cheyette00:00.108
3.hum@b0t
91
00:00.158

* 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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