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. DarkChamp 00:41.59
2. gtkrouwel
140
00:42.93
3. Billo93 00:54.35
4. tt1029
134
00:58.50
5. KongeBob 01:10.54
6. Hachiman 01:10.99
7. zenzaburo 01:11.92
8. highprime
152
01:12.11
9. Twipsii 01:12.45
10. Dust14
97
01:13.46
11. Totoro1997
1
01:18.93
12. Theck
31
01:19.02
13. DdBbon 01:22.72
14. iovichulo413
56
01:27.77
15. Demeter
195
01:28.68
16. Jananana
58
01:30.54
17. Thrillhou
17
01:30.57
18. Hesper
92
01:32.77
19. ojyojyojy
50
01:33.44
20. nbapip 01:35.90
This Week
1. tt1029
134
01:01.00
2. KongeBob 01:10.54
3. highprime
152
01:12.11
4. Hachiman 01:14.79
5. zenzaburo 01:16.04
6. Totoro1997
1
01:18.93
7. DdBbon 01:26.11
8. iovichulo413
56
01:27.77
9. Hesper
92
01:32.77
10. fimcg 01:44.15
11. Jananana
58
01:49.31
12. Vaugnon 01:57.68
13. Demeter
195
01:58.72
14. Kelizo
43
02:15.16
15. xiang10231
16
02:15.17
16. bsk5941
104
02:22.78
17. AnonyMinor
91
02:31.50
18. aequidens
273
02:34.23
19. AzuReVaPouR 02:34.56
20. hiptopoker 02:35.39
Today
1. tt1029
134
01:06.74
2. Totoro1997
1
01:18.93
3. highprime
152
01:52.34
4. Demeter
195
01:58.72
5. Kelizo
43
02:32.22
6. Corallystarfish
54
02:35.97
7. linluo
16
03:21.47
8. NanogramFreak 05:10.79
9. KillerBee
144
05:13.98
10. Beastinboston
64
06:30.19
11. AndrewTeng00729
9
06:57.13
12. 999111 09:34.57
13.--- empty -----:--
14.--- empty -----:--
15.--- empty -----:--
16.--- empty -----:--
17.--- empty -----:--
18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
MO3
1.anonymous
322
00:50.09
2. TashiroMiraki
231
00:51.08
3. gtkrouwel
140
00:53.56
4. 강일출
185
01:02.56
5. Mark M.
117
01:02.66
6. sfumato
168
01:02.97
7. Yeti
143
01:04.76
8. Moooon
132
01:06.76
9. Thomas Garner
180
01:07.35
10. mtanzer
140
01:08.67
AO5
1.anonymous
322
00:53.75
2. TashiroMiraki
231
00:53.76
3. gtkrouwel
140
00:57.45
4. Mark M.
117
01:05.59
5. 강일출
185
01:07.85
6. mtanzer
140
01:09.99
7. Yeti
143
01:10.08
8. Thomas Garner
180
01:11.20
9. Moooon
132
01:14.07
10. Klunk
24
01:15.24
AO12
1.anonymous
322
01:02.65
2. gtkrouwel
140
01:03.90
3. TashiroMiraki
231
01:11.46
4. Yeti
143
01:21.79
5. Thomas Garner
180
01:23.14
6. 강일출
185
01:24.51
7. Mark M.
117
01:25.52
8. mtanzer
140
01:26.99
9. Moooon
132
01:28.65
10. dxjonas
162
01:29.41
Robots / programmatic solversinfo  
1.tlstyer
151
00:00.014
2.siebi
1
00:00.038
3.hum@b0t
91
00:00.169

* 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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