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How to solve Videos Forum Timed Rankings Books Print   Solution 3 Feb 2025
Easy:
4×4
5×5
6×6
Killer
Sudoku
Medium:
4×4
6×6
7×7
Sudoku
Difficult:
4×4
5×5
6×6
7×7
9×9
Extra
Difficult 7 × 7, Rating: ★★★★★      Solved 340 times
abcdefg
1 
3-
140×
 
6^
 
0-
2 mod
Clear cell
Bold cell
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2 
 
81^
 
 
 
 
 
3 
 
 
24×
 
35×
 
120×
4 
1^
7
 
14+
2
 
 
5 
 
 
1-
 
 
126×
 
6 
3-
 
 
 
 
 
729^
7 
 
7+
 
5
 
2
 

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 a longer explanation.

Note: this puzzle also uses the exponentiation operator ^
Example: 2^3 = 2 x 2 x 2 = 8
Or, with three digits: 2^4^2 = 2^(4^2) = 2^16 = 65536
Note: evaluation is right to left

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