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How to solve Videos Forum Timed Rankings  PDF Print   Hide solution 2 Apr 2013
Easy:
4×4
5×5
6×6
Killer
Sudoku
Medium:
4×4
6×6
8×8
Killer
Sudoku
Difficult:
4×4
6×6
8×8
9×9
Extra
Difficult 9 × 9, Rating: ★★★★★★      Solved 189 times

The World's Hardest Calcudoku
can you solve it?
abcdefghi
1 
21+
9

2

7
60×
3

5

1
25+
4

6

8
2 

2
6-
9

3
11+
6

4
4-
7
13+
5

8

1
3 

1
8+
7
8
8

5
2
2

3
9
9
11+
4

6
4 
24+
6

1
13+
9

4
25+
8
3-
5

2

7
17+
3
5 

7

8
2
2

1

9

6
3
3

5

4
6 

3
1-
4
13+
6

7

1
1-
9

8
11+
2

5
7 
26+
5

3
1
1
16×
8
6
6
12+
4
7
7

9
25+
2
8 

4
1-
6

5

2
378×
7

8
1

3

9
9 

8

5

4

9

3

2

6

1

7

Note that now you have two days to solve this puzzle (submit before Thursday)

total
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