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 00:05.43
2. niqnna
18
00:07.12
3. JiangGe 00:07.31
4. kennethaw88
160
00:07.97
5. ojyojyojy
53
00:08.54
6. Lovrenac
14
00:08.57
7. lavaduck
35
00:09.00
8. Toksku 00:10.55
9. NickNikolov 00:10.61
10. pipifax 00:10.88
11. Tuffi
34
00:11.57
12. Strider500
122
00:11.69
13. Ledorian01
30
00:12.14
14. llmt9
102
00:12.28
15. Scr33n 00:12.64
16. Galaxy21
73
00:12.80
17. HackMan
125
00:12.90
17. dbut2
45
00:12.90
19. appolcrumbol
19
00:13.00
20. 71448Eva
10
00:13.34
This Week
1. zenzaburo 00:05.43
2. niqnna
18
00:07.12
3. JiangGe 00:07.31
4. kennethaw88
160
00:07.97
5. Toksku 00:10.55
6. pipifax 00:10.88
7. Tuffi
34
00:11.57
8. appolcrumbol
19
00:13.00
9. HackMan
125
00:16.98
10. Mathematics 00:19.15
11. unko
21
00:21.77
12. isaaa05
6
00:29.48
13. chrispy
84
00:56.90
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Today
1. zenzaburo 00:09.00
2. niqnna
18
00:09.05
3. appolcrumbol
19
00:13.00
4. Mathematics 00:19.15
5. HackMan
125
00:20.91
6.--- empty -----:--
7.--- empty -----:--
8.--- empty -----:--
9.--- empty -----:--
10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
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MO3
1.anonymous
322
00:04.21
2. Yeti
143
00:05.19
3. vowels
216
00:05.21
4. mtanzer
140
00:05.22
5. Arok
115
00:05.24
6. gt83
140
00:05.36
7. sfumato
168
00:05.44
8. sauceguardian
111
00:05.81
9. TashiroMiraki
232
00:05.91
10. PuzzleMaestro
101
00:05.94
AO5
1.anonymous
322
00:04.76
2. gt83
140
00:05.49
3. Yeti
143
00:05.87
4. mtanzer
140
00:05.96
5. sfumato
168
00:06.02
6. Arok
115
00:06.06
7. TashiroMiraki
232
00:06.18
8. sauceguardian
111
00:06.20
9. 2015YINJ02
187
00:06.23
10. vowels
216
00:06.31
AO12
1.anonymous
322
00:05.38
2. Yeti
143
00:06.20
3. gt83
140
00:06.29
4. sfumato
168
00:06.43
5. mtanzer
140
00:06.94
5. Arok
115
00:06.94
7. TashiroMiraki
232
00:07.08
8. sauceguardian
111
00:07.10
9. qqwref
266
00:07.20
10. Douglas Shamlin Jr.
723
00:07.34
Robots / programmatic solversinfo  
1.tlstyer
152
00:00.006
2.siebi
1
00:00.007
3.cheyette00:00.141

* 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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