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7 Dec 2017
Easy:
4×4
5×5
Sudoku
Medium:
4×4
5×5
6×6
8×8
Killer
Sudoku
Difficult:
4×4
5×5
6×6
8×8
12×12
Extra
Difficult 8 × 8, Rating: ★★★★★      Solved 202 times
abcdefgh
1
3
3
32×
4

8
1-
7
1-
6

5
2
2
1
1
2
0 mod
8
0 mod
5

1

2

4
7 mod
7
6
6
1-
3
3

2
2 mod
7

5
2-
6

1

8
5-
3

4
4
2-
4

6
2
2

3
2-
5

1

8
1 mod
7
5
13+
5

8
4
4
1 mod
1

2
21×
3

7

6
6
6-
1
1-
3
0 mod
6

8
1-
7
4 mod
4
4-
5
3-
2
7

7

2

3
19+
4

8

6

1

5
8
5-
6

1

7

5

3
1 :
2

4

8

Note: this puzzle also uses the modulo operator mod
a mod b = r means that when dividing a by b, the remainder is r. For example, 5 mod 2 = 1, and 3 mod 5 = 3.
Look here for some more explanations.

total
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