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. tt1029
136
00:58.50
2. Hachiman 01:02.74
3. KongeBob 01:10.54
4. highprime
153
01:12.11
5. zenzaburo 01:12.60
6. Dust14
98
01:13.46
7. Totoro1997
1
01:18.93
8. Jananana
59
01:25.82
9. DdBbon 01:26.11
10. mmmmtra
25
01:26.55
11. iovichulo413
56
01:27.77
12. erichiro 01:28.06
13. Demeter
196
01:28.68
14. durugyakos 01:30.43
15. Thrillhou
18
01:32.44
16. Hesper
93
01:32.77
17. ojyojyojy
53
01:33.44
18. wldnekz1 01:39.83
19. baimouren
94
01:43.28
20. fimcg 01:44.15
This Week
1. Hachiman 01:02.74
2. tt1029
136
01:07.96
3. zenzaburo 01:12.60
4. highprime
153
01:25.40
5. Jananana
59
01:25.82
6. erichiro 01:28.06
7. durugyakos 01:30.43
8. Hesper
93
01:37.63
9. wldnekz1 01:39.83
10. Thrillhou
18
01:41.55
11. HackMan
125
01:58.68
12. Angelila 02:02.85
13. Vaugnon 02:06.97
14. bsk5941
105
02:12.54
15. AnonyMinor
91
02:30.28
16. spst42
12
02:39.79
17. AzuReVaPouR 02:40.73
18. hiptopoker 02:43.35
19. Limax 02:44.72
20. japinkole 03:02.51
Today
1. tt1029
136
01:10.81
2. zenzaburo 01:12.60
3. HackMan
125
01:58.68
4. Angelila 02:02.85
5. Jananana
59
02:03.03
6. hiptopoker 02:43.35
7. AzuReVaPouR 03:04.37
8. Kelizo
43
03:09.45
9. 999111 04:55.66
10. NanogramFreak 06:45.39
11. aguacate
13
07:38.85
12.--- empty -----:--
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
232
00:51.08
3. gt83
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
134
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
232
00:53.76
3. gt83
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
134
01:14.07
10. Klunk
24
01:15.24
AO12
1.anonymous
322
01:02.65
2. gt83
140
01:03.90
3. TashiroMiraki
232
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
134
01:28.65
10. dxjonas
163
01:29.41
Robots / programmatic solversinfo  
1.tlstyer
152
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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