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How to solve Videos Forum Timed Rankings Books Print → Subscribe   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 253 times

The World's Hardest Calcudoku
can you solve it?
abcdefghi
1 
21+
 
 
60×
 
 
25+
 
 
Clear cell
Bold cell
Toggle pencil mode
Hide buttons
Change buttons position
Undo
2 
 
6-
 
11+
 
4-
13+
 
 
3 
 
8+
8
 
2
 
9
11+
 
4 
24+
 
13+
 
25+
3-
 
 
17+
5 
 
 
2
 
 
 
3
 
 
6 
 
1-
13+
 
 
1-
 
11+
 
7 
26+
 
1
16×
6
12+
7
 
25+
8 
 
1-
 
 
378×
 
 
 
9 
 
 
 
 
 
 
 
 
 
Undo Start over Change puzzle size
total
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