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Hitori is a numerical puzzle created in Japan. Hitori is a 3x3 to 25x25 square field with each cell filled with either a number or a letter. No row or column can have more than one occurrence of any given number. The goal is to find the numbers that have been placed incorrectly and mark them black.

The black cells must to touch either horizontally or vertically, but there can be diagonally adjacent black cells. The cells that remain blank have to touch others, as well as any of the surfaces, and create a single area.

A left mouse click can be used to mark cells black. The cells that duplicate and, therefore, were filled incorrectly are highlighted red. The red color for duplicates in a single row is brighter than the one for duplicates in the same column. The right click can also be used to mark the cells that are most likely not to be black. However, this mark is only supplementary and does not affect the solution check.

To check whether Hitori has been solved correctly, please click the corresponding button. Mistakes are marked in red, whereas the pink color shows the isolated areas. The number of black cells must not exceed the one specified in the problem; otherwise, the check button will become inactive.

Suitable for smartphones
Likes 7
Times solved 8
x1
2023-02-08 07:00
00:38
1 17%
8x8
15
Likes 34
Times solved 38
x1
2023-01-31 09:28
00:42
1 22%
9x9
21
Likes 27
Times solved 29
x1
2023-01-26 15:41
00:39
1 17%
9x9
22
Likes 18 Dislikes 1
Times solved 22
x1
2023-02-07 07:01
00:33
1 22%
8x8
16
Likes 28 Dislikes 2
Times solved 34
x1
2023-01-26 01:37
00:37
1 20%
6x6
10
Likes 24
Times solved 29
x2
2023-01-18 06:21
06:21
2 49%
21x21
66
Likes 36
Times solved 40
x1
2023-01-14 13:46
00:06
1 2%
4x4
5
Likes 35
Times solved 40
x1
2023-01-12 22:11
00:10
1 2%
5x5
7
Likes 35
Times solved 36
x1
2023-01-11 11:03
00:14
1 5%
4x4
4
Likes 29
Times solved 32
x1
2023-01-11 11:27
00:28
1 14%
7x7
11
Likes 15 Dislikes 1
Times solved 18
x2
2023-01-25 22:29
02:52
1 22%
19x19
54
Likes 27
Times solved 28
x1
2023-01-14 18:00
00:09
1 0%
4x4
5
Likes 27
Times solved 27
x1
2023-01-16 21:20
00:07
1 0%
4x4
5
Likes 15
Times solved 17
x1
2023-01-18 22:44
01:31
1 23%
13x13
35
Likes 24
Times solved 25
x1
2023-01-16 21:31
00:18
1 5%
6x6
10
Likes 23
Times solved 25
x1
2023-01-14 09:04
01:08
1 15%
12x12
31
Likes 13
Times solved 14
x2
2023-01-19 18:00
02:28
1 18%
17x17
45
Likes 21
Times solved 21
x2
2023-01-12 17:08
01:59
1 20%
18x18
47
Likes 20
Times solved 20
x1
2023-01-16 21:12
00:27
1 9%
7x7
14
Likes 22 Dislikes 1
Times solved 26
x1
2023-01-12 00:32
01:22
1 20%
11x11
32
Likes 26 Dislikes 2
Times solved 29
x1
2023-01-13 17:43
00:23
1 13%
7x7
13
Likes 24
Times solved 26
x1
2023-01-10 00:55
01:38
1 12%
15x15
42
Likes 6 Dislikes 1
Times solved 8
x1
2023-02-01 12:00
00:27
1 17%
9x9
22
Likes 24 Dislikes 1
Times solved 28
x1
2023-01-10 22:14
00:51
1 28%
8x8
18
Likes 22 Dislikes 1
Times solved 24
x3
2023-01-10 22:30
06:29
2 43%
25x25
91
Likes 14 Dislikes 1
Times solved 15
x1
2023-01-16 21:40
02:46
1 27%
15x15
44
Likes 37 Dislikes 1
Times solved 41
x1
2023-01-05 12:21
00:06
1 9%
4x4
4
Likes 31
Times solved 33
x1
2023-01-05 18:56
00:06
1 6%
4x4
4
Likes 20
Times solved 22
x1
2023-01-07 18:27
01:44
1 18%
15x15
43
Likes 17
Times solved 19
x1
2023-01-05 18:37
01:23
1 10%
11x11
31
Likes 17 Dislikes 1
Times solved 19
x2
2023-01-04 18:18
03:12
1 26%
20x20
53
Likes 28 Dislikes 1
Times solved 31
x1
2022-12-25 10:21
00:35
1 18%
8x8
18
Likes 20 Dislikes 1
Times solved 22
x1
2023-01-01 12:00
00:11
1 3%
5x5
7
Likes 25
Times solved 28
x1
2022-12-20 21:00
00:17
1 7%
5x5
8
Likes 25
Times solved 28
x1
2022-12-20 21:00
00:14
1 5%
6x6
7
Likes 29 Dislikes 1
Times solved 33
x1
2022-12-17 18:00
00:08
1 4%
4x4
4
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