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How to solve Videos Forum Timed Rankings Books Specials Print 20 Nov 2017
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
7 × 7 Extra, Rating: ★★★★★  Points: 8     Solved 6 times
Calcudoku twin  -  these two puzzles have the same solution

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