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 00:05.96
2. grimmgirlfandom
171
00:06.62
3. niqnna
18
00:07.52
4. Momiji142857
19
00:07.76
5. BeccaWorm
129
00:08.41
6. Pablo The Penguin
13
00:08.58
7. pipifax 00:08.93
8. Emzed
71
00:08.94
9. Einsteinus
121
00:09.06
10. Zangzihan 00:09.89
11. kennethaw88
156
00:10.26
12. LordHedgie
5
00:10.33
13. Strider500
114
00:11.30
14. KingQuiny 00:12.45
15. Kwikkel 00:13.05
16. paejunk
58
00:13.07
17. cowtown 00:13.14
18. HackMan
123
00:13.17
19. Manduniko
10
00:13.67
20. LordCarbonade
9
00:14.05
This Week
1. zenzaburo 00:08.00
2. niqnna
18
00:08.03
3. Emzed
71
00:08.94
4. Kwikkel 00:13.05
5. LordCarbonade
9
00:14.05
6. lobey 00:15.29
7. paejunk
58
00:16.35
8. pipifax 00:18.63
9. Nebbo 00:19.13
10. smdlvt67 00:22.24
11. -Jason-
28
00:22.35
12. Langrace
3
00:24.75
13. Rod Ellison
36
00:24.85
14. qobi
237
00:25.29
15. EmeryEmery
8
00:25.86
16. ojyojyojy
35
00:27.73
17. AstroNovalite
34
00:31.16
18. chrispy
78
00:35.18
19. MatiZ1994
8
00:36.18
20. Linzi1996
5
10d 01:50:10.52
Today
1. zenzaburo 00:08.00
2. niqnna
18
00:08.03
3. LordCarbonade
9
00:14.05
4.--- empty -----:--
5.--- empty -----:--
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
320
00:04.21
2. Yeti
140
00:05.19
3. vowels
216
00:05.21
4. mtanzer
140
00:05.22
5. Arok
115
00:05.24
6. gtkrouwel
135
00:05.36
7. sfumato
168
00:05.44
8. sauceguardian
106
00:05.81
9. TashiroMiraki
227
00:05.91
10. PuzzleMaestro
92
00:05.94
AO5
1. numbrr
320
00:04.76
2. gtkrouwel
135
00:05.49
3. Yeti
140
00:05.87
4. mtanzer
140
00:05.96
5. sfumato
168
00:06.02
6. Arok
115
00:06.06
7. TashiroMiraki
227
00:06.18
8. sauceguardian
106
00:06.20
9. vowels
216
00:06.31
10. jaybrainer
265
00:06.33
AO12
1. numbrr
320
00:05.38
2. Yeti
140
00:06.20
3. gtkrouwel
135
00:06.29
4. sfumato
168
00:06.43
5. mtanzer
140
00:06.94
5. Arok
115
00:06.94
7. TashiroMiraki
227
00:07.08
8. sauceguardian
106
00:07.10
9. qqwref
266
00:07.20
10. Douglas Shamlin Jr.
720
00:07.34
Robots / programmatic solversinfo  
1.tlstyer
148
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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