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 00:03.84
2. niqnna
18
00:04.14
3. Piroska9
74
00:04.71
4. grimmgirlfandom
171
00:04.79
5. Zangzihan 00:05.33
6. EricLuo123
12
00:06.31
7. timber_klinx
37
00:06.83
8. Emzed
71
00:07.33
9. llmt9
95
00:07.49
10. Einsteinus
121
00:08.41
11. Momiji142857
19
00:09.03
12. Odenzon
32
00:10.17
13. baimouren
75
00:11.45
14. Langrace
3
00:11.85
15. vipinjain
49
00:12.70
16. amdo1 00:14.31
17. -Jason-
28
00:14.63
18. qobi
237
00:15.11
19. Macy
60
00:15.15
20. cowtown 00:15.29
This Week
1. zenzaburo 00:04.23
2. Piroska9
74
00:04.71
3. niqnna
18
00:04.86
4. Zangzihan 00:05.33
5. Emzed
71
00:07.33
6. llmt9
95
00:07.49
7. baimouren
75
00:11.45
8. Langrace
3
00:11.85
9. qobi
237
00:15.11
10. Macy
60
00:15.15
11. EG0hun 00:20.92
12. -Jason-
28
00:39.12
13. ojyojyojy
35
00:45.46
14. EmeryEmery
8
02:27.67
15. Uthor 20d 01:35:32.68
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
Today
1. zenzaburo 00:04.77
2. niqnna
18
00:04.86
3. llmt9
95
00:14.52
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
00:02.83
2. vowels
216
00:03.01
3. mtanzer
140
00:03.39
4. jaybrainer
265
00:03.47
5. TashiroMiraki
227
00:03.58
6. Yeti
140
00:03.87
7. gtkrouwel
135
00:04.13
8. Klunk
24
00:04.23
9. Nick
217
00:04.31
10. Oryn
178
00:04.33
AO5
1. numbrr
320
00:03.30
2. vowels
216
00:03.35
3. mtanzer
140
00:03.83
4. Yeti
140
00:04.15
5. TashiroMiraki
227
00:04.25
6. gtkrouwel
135
00:04.29
7. jaybrainer
265
00:04.33
8. Klunk
24
00:04.42
9. Oryn
178
00:04.65
10. Asitukl
20
00:04.73
AO12
1. numbrr
320
00:04.19
2. vowels
216
00:04.71
3. gtkrouwel
135
00:04.88
4. mtanzer
140
00:05.02
5. Oryn
178
00:05.62
6. TashiroMiraki
227
00:05.86
7. Nick
217
00:05.93
8. jaybrainer
265
00:06.26
9. Yeti
140
00:06.50
10. sfumato
168
00:06.53
Robots / programmatic solversinfo  
1.tlstyer
148
00:00.007
2.cheyette00:00.115
3.hum@b0t
91
00:00.159

* 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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