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. yyyyyyyejin
115
00:06.56
3. niqnna
18
00:07.51
4. highprime
141
00:07.55
5. josefelia 00:07.83
6. LemonSherbet 00:07.98
7. 2021zhao07
23
00:08.42
8. LordHedgie 00:09.25
9. monjo 00:09.39
10. pipifax 00:09.76
11. Daehyeok Kwon
51
00:09.84
12. NiceJake
28
00:10.42
13. sqw0tb7zc
17
00:10.90
14. turciaaIt
18
00:11.06
15. barruf
123
00:11.21
16. Thrillhou
3
00:11.41
17. Anna Redzik
54
00:11.78
18. AnonyMinor
79
00:11.96
19. pph4br
14
00:12.26
20. Strider500
110
00:12.40
This Week
1. zenzaburo 00:06.06
2. niqnna
18
00:09.15
3. Daehyeok Kwon
51
00:09.84
4. barruf
123
00:11.21
5. Thrillhou
3
00:11.41
6. pph4br
14
00:12.26
7. Strider500
110
00:12.40
8. LordHedgie 00:12.93
9. grimmgirlfandom
169
00:15.09
10. 12345678999 00:16.09
11. tightlikerope 00:17.36
12. dprince29 00:17.67
13. Mg2
15
00:19.86
14. p.阿久
10
00:21.30
15. chenyang 00:21.76
16. Jargalkhuu Batkhuu
5
00:23.02
17. Macy
55
00:27.54
18. chrispy
76
00:53.97
19. dahu980206 00:57.66
20. scheyette
11
01:22.51
Today
1. zenzaburo 00:09.10
2. barruf
123
00:11.21
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8.--- empty -----:--
9.--- empty -----:--
10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
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MO3
1. numbrr
315
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
167
00:05.44
8. sauceguardian
105
00:05.81
9. TashiroMiraki
224
00:05.91
10. PuzzleMaestro
92
00:05.94
AO5
1. numbrr
315
00:04.76
2. gtkrouwel
134
00:05.49
3. Yeti
138
00:05.87
4. mtanzer
140
00:05.96
5. sfumato
167
00:06.02
6. Arok
115
00:06.06
7. TashiroMiraki
224
00:06.18
8. sauceguardian
105
00:06.20
9. vowels
216
00:06.31
10. jaybrainer
260
00:06.33
AO12
1. numbrr
315
00:05.38
2. Yeti
138
00:06.20
3. gtkrouwel
134
00:06.29
4. sfumato
167
00:06.43
5. mtanzer
140
00:06.94
5. Arok
115
00:06.94
7. TashiroMiraki
224
00:07.08
8. sauceguardian
105
00:07.10
9. qqwref
266
00:07.20
10. Douglas Shamlin Jr.
719
00:07.34
Robots / programmatic solversinfo  
1.tlstyer
144
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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