Weekly Extreme Sudoku Competition for Dec 30 to Jan 5

Number 641, Extreme
by Crosswords Ltd. January puzzle packs Now Out!. Thanks for supporting our site.
Future Puzzle - will be submitted on the relevant day
1 2 3 4 5 6 7 8 9
A
B
C
D
E
F
G
H
J
2     5          
  8 3   6 4      
  1     2        
3     9          
    6       2 1 4
          2     3
              3  
      1 7   8 4  
      6   5     7