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. TomGuo
152
00:52.55
2. tt1029
120
00:57.09
3. Squid
57
01:04.31
4. zenzaburo 01:06.08
5. mmmmtra 01:13.55
6. highprime
140
01:17.51
7. iovichulo413
52
01:17.72
8. cryptOakmont 01:18.19
9. Changanlouli
48
01:18.26
10. Thrillhou 01:18.38
11. Twipsii 01:20.49
12. DdBbon 01:20.78
13. keehaag
169
01:21.90
14. Candyman 01:21.99
15. wldnekz1 01:25.74
16. TheET 01:28.14
17. jonasb
52
01:32.12
18. Laura Järvinen
58
01:34.55
19. bonelessmoth 01:35.22
20. wamfly
21
01:39.90
This Week
1. tt1029
120
01:00.75
2. TomGuo
152
01:01.94
3. zenzaburo 01:07.94
4. Squid
57
01:08.27
5. mmmmtra 01:13.55
6. highprime
140
01:17.51
7. cryptOakmont 01:18.93
8. Candyman 01:21.99
9. DdBbon 01:24.68
10. Thrillhou 01:34.18
11. Laura Järvinen
58
01:36.83
12. wamfly
21
01:40.61
13. bbbbbbbbbbbb 01:41.02
14. KongeBob 01:42.43
15. niqnna
18
01:45.01
16. bwangarang
72
02:12.31
17. Gigiw
86
02:15.35
18. sunshinecat
31
02:21.25
19. Jananana
44
02:25.79
20. keehaag
169
02:32.60
Today
1. tt1029
120
01:01.61
2. mmmmtra 01:13.55
3. Laura Järvinen
58
01:36.83
4. highprime
140
02:02.32
5. sunshinecat
31
02:21.25
6. EricLuo123
4
02:52.04
7. Gigiw
86
03:17.99
8. Strider500
108
03:43.39
9. yilasan
5
04:55.47
10. 999111 06:21.36
11. Kelizo
37
07:19.46
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
MO3
1. numbrr
313
00:50.09
2. TashiroMiraki
224
00:51.08
3. 강일출
179
01:02.56
4. Mark M.
115
01:02.66
5. sfumato
166
01:02.97
6. Yeti
138
01:04.76
7. gtkrouwel
134
01:05.10
8. mtanzer
140
01:08.67
9. 2015YINJ02
180
01:09.95
10. Thomas Garner
174
01:10.08
AO5
1. numbrr
313
00:53.75
2. TashiroMiraki
224
00:53.76
3. Mark M.
115
01:05.59
4. 강일출
179
01:07.85
5. gtkrouwel
134
01:08.46
6. mtanzer
140
01:09.99
7. Yeti
138
01:10.08
8. Thomas Garner
174
01:12.16
9. Klunk
24
01:15.24
10. dxjonas
149
01:16.00
AO12
1. numbrr
313
01:10.81
2. TashiroMiraki
224
01:11.46
3. gtkrouwel
134
01:14.83
4. Yeti
138
01:21.79
5. Thomas Garner
174
01:23.14
6. 강일출
179
01:24.51
7. Mark M.
115
01:25.52
8. mtanzer
140
01:26.99
9. dxjonas
149
01:29.41
10. Moooon
124
01:34.07
Robots / programmatic solversinfo  
1.tlstyer
143
00:00.014
2.hum@b0t
91
00:00.169
3.preciousmouse
74
00:01.075

* 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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