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. gtkrouwel
135
00:42.66
2. Yeti
139
00:53.41
3. TomGuo
153
00:57.30
4. tt1029
122
00:59.32
5. zenzaburo 01:01.76
6. Goomy
138
01:37.40
7. boru
127
01:43.83
8. Emgold 01:45.44
9. CrlD
121
01:47.98
10. Dorice
267
01:53.26
11. niqnna
18
01:53.80
12. LemonSherbet 01:54.76
13. Jananana
46
02:00.78
14. nerdvert
100
02:03.54
15. BeccaWorm
126
02:05.68
16. Amator 02:06.65
17. AnonyMinor
80
02:15.05
18. Praktisix
127
02:17.37
19. SWICT
51
02:20.77
20. Anna Redzik
55
02:23.04
This Week
1. tt1029
122
01:05.15
2. zenzaburo 01:09.49
3. Goomy
138
01:37.40
4. Dorice
267
01:57.61
5. Amator 02:06.65
6. AnonyMinor
80
02:16.09
7. BeccaWorm
126
02:18.23
8. Praktisix
127
02:58.05
9. ineauno
11
03:13.20
10. LeiaKasta
32
04:23.86
11. barruf
124
05:01.40
12. LikeGazelle
23
05:48.33
13. shadow197594682
11
08:08.19
14. Jefferson111222
36
08:18.11
15. cowtown 08:29.14
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Today
1. Praktisix
127
03:52.40
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MO3
1. numbrr
315
00:46.10
2. TashiroMiraki
225
00:47.55
3. gtkrouwel
135
00:48.99
4. Yeti
139
00:55.46
5. sfumato
167
01:01.21
6. qqwref
266
01:05.62
7. Nick
217
01:07.31
8. mtanzer
140
01:10.95
9. tt1029
122
01:11.15
10. 2015YINJ02
181
01:12.11
AO5
1. numbrr
315
00:46.10
2. TashiroMiraki
225
00:51.06
3. gtkrouwel
135
00:52.43
4. Yeti
139
00:56.52
5. sfumato
167
01:08.37
6. mtanzer
140
01:11.61
7. tt1029
122
01:12.61
8. qqwref
266
01:13.56
9. summernight
233
01:14.94
10. 2015YINJ02
181
01:15.93
AO12
1. numbrr
315
00:55.85
2. gtkrouwel
135
00:56.02
3. TashiroMiraki
225
00:56.88
4. Yeti
139
01:09.44
5. summernight
233
01:19.65
6. qqwref
266
01:23.77
7. Oryn
175
01:24.66
8. mtanzer
140
01:25.21
9. sfumato
167
01:32.17
10. 2015YINJ02
181
01:33.71
Robots / programmatic solversinfo  
1.tlstyer
145
00:00.011
2.hum@b0t
91
00:00.163
3.cheyette00:02.504

* 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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