The "Light Up" puzzle (also known as "Akari", "LightUP" and "lanterns") is a rectangular box in which some cells are white, and some are black. The black cells can contain numbers from 0 to 4. The goal of the puzzle is to place light bulbs in empty cells so that all white cells are illuminated.

The light from the bulb is distributed in a straight line horizontally and vertically until you hit a black cell or the border of the field. Bulbs should not face each other. If there is a number in a black cell, then it must be adjacent (on the left, top, right or bottom) to a specified number of bulbs, no more and no less.

17 4
22
x2
2023-02-08 09:04
08:15
74%
12x19
25 1
29
x2
2023-02-07 21:04
02:05
44%
12x19
32 1
37
x2
2023-02-07 01:39
01:27
42%
12x19
30
35
x2
2023-02-01 02:41
01:02
40%
12x19
22
30
x2
2023-02-02 18:37
01:28
27%
12x19
24
29
x2
2023-02-03 22:29
00:57
32%
12x19
13
21
x2
2023-02-04 22:59
02:00
31%
12x19
15
17
x3
2023-02-01 12:00
02:26
42%
13x20
13
16
x2
2023-02-01 12:00
01:31
42%
12x19
13
16
x3
2023-02-05 03:03
02:33
34%
13x20
23 1
31
x2
2023-01-28 18:15
01:11
36%
12x19
20 1
27
x2
2023-01-28 22:14
02:00
43%
12x19
25
31
x2
2023-01-24 13:41
01:52
41%
12x19
26
30
x2
2023-01-20 01:41
04:26
54%
12x19
30 1
37
x2
2023-01-19 09:28
01:37
35%
12x19
13
18
x2
2023-01-28 18:00
02:50
35%
12x19
24 1
29
x2
2023-01-22 10:21
02:44
41%
12x19
18
21
x1
2023-01-19 21:08
01:06
29%
11x11
18
20
x1
2023-01-19 23:30
00:28
13%
11x11
14 1
20
x2
2023-01-31 22:59
02:50
48%
12x19
20 1
26
x2
2023-01-21 22:59
01:32
34%
12x19
15
18
x1
2023-01-19 21:32
01:57
31%
11x11
30
39
x1
2023-01-09 21:40
00:54
20%
11x11
18 1
24
x2
2023-01-23 22:59
03:16
46%
12x19
17 1
24
x1
2023-01-19 21:16
01:04
23%
11x11
27
34
x1
2023-01-09 21:24
01:02
22%
11x11
16 1
21
x1
2023-01-19 21:24
01:11
31%
11x11
15 1
21
x1
2023-01-19 21:40
01:13
22%
11x11
25
31
x1
2023-01-09 21:32
00:44
34%
9x9
15
20
x2
2023-01-14 18:00
05:25
54%
12x19
21
27
x1
2023-01-09 21:16
01:07
22%
11x11
17 1
26
x2
2023-01-16 18:00
01:12
30%
12x19
17 1
25
x2
2023-01-16 18:00
01:09
32%
12x19
17 1
23
x2
2023-01-11 18:56
02:52
48%
12x19
16 1
23
x2
2023-01-17 07:00
02:28
41%
12x19
23
30
x1
2023-01-06 21:14
00:52
25%
11x11