Weekly Extreme Sudoku Competition for Jun 2 to Jun 8

Number 663, 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
4       6        
8   9       6    
  7             9
    5 6 3     2  
  9   8   2   6 4
        7 1 8    
3             4  
    2       3    
        4       5