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 00:03.61
2. niqnna
18
00:03.71
3. Ontwikseltsaar
103
00:03.82
4. LemonSherbet 00:04.08
5. Truth-or-Peace
134
00:04.19
6. highprime
140
00:04.57
7. puzzlingpatzer
93
00:04.59
8. BeccaWorm
124
00:04.95
9. MARTIN1979
101
00:05.38
10. Piroska9
73
00:05.54
11. thelegendary08
34
00:06.19
12. SWICT
45
00:06.76
13. Strider500
109
00:06.92
14. _seek3r
12
00:07.16
15. MathsNebUla
8
00:07.25
16. Elevatorkat 00:07.27
17. StarAcrs
6
00:07.65
18. i'm ly
150
00:07.66
19. chenyang 00:08.71
20. PaniOlga 00:09.40
This Week
1. zenzaburo 00:03.85
2. niqnna
18
00:03.98
3. BeccaWorm
124
00:04.95
4. MARTIN1979
101
00:05.38
5. Truth-or-Peace
134
00:05.68
6. _seek3r
12
00:07.16
7. StarAcrs
6
00:07.65
8. HollowKing 00:09.80
9. puzzlingpatzer
93
00:10.13
10. tightlikerope 00:12.48
11. superli
5
00:14.04
12. brody2
14
00:14.84
13. haitao 00:15.78
14. Grymhar 00:15.79
15. DanBe202
2
00:20.75
16. cowtown 00:32.14
17. Yuanzhe Gao
7
00:51.94
18. Uthor 12d 06:32:26.46
19.--- empty -----:--
20.--- empty -----:--
Today
1. zenzaburo 00:05.69
2. brody2
14
00:14.84
3. DanBe202
2
00:20.75
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
314
00:02.41
2. jaybrainer
260
00:02.52
3. vowels
216
00:02.71
4. Arok
115
00:02.86
5. Yeti
138
00:02.89
6. mtanzer
140
00:03.06
6. Douglas Shamlin Jr.
719
00:03.06
8. gtkrouwel
134
00:03.18
9. nabi
92
00:03.21
10. TashiroMiraki
224
00:03.43
AO5
1. numbrr
314
00:02.62
2. jaybrainer
260
00:02.75
3. vowels
216
00:03.02
4. Douglas Shamlin Jr.
719
00:03.09
5. Yeti
138
00:03.20
6. Arok
115
00:03.23
7. mtanzer
140
00:03.25
7. nabi
92
00:03.25
9. TashiroMiraki
224
00:03.59
10. gtkrouwel
134
00:03.68
AO12
1. numbrr
314
00:03.28
2. jaybrainer
260
00:03.30
3. Yeti
138
00:03.69
4. vowels
216
00:03.83
5. mtanzer
140
00:03.89
6. Arok
115
00:04.12
7. gtkrouwel
134
00:04.27
8. Douglas Shamlin Jr.
719
00:04.52
9. sfumato
166
00:04.54
10. Oryn
173
00:04.57
Robots / programmatic solversinfo  
1.tlstyer
143
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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