Weekly Extreme Killer Sudoku Competition for Feb 1 to Feb 7

Number 6357, Extreme
by Crosswords Ltd. February puzzle packs Now Out!. Thanks for supporting our site.
All entries must be in by the end of Saturday, Feb 7 23:59 EST, USA

1 2 3 4 5 6 7 8 9
A
B
C
D
E
F
G
H
J
9
11
 
12
 
16
 
17
 
 
19
 
 
 
 
 
7
 
13
 
 
16
17
13
18
 
 
14
15
 
 
 
 
 
 
14
 
 
 
8
 
 
20
 
 
 
18
 
13
11
8
 
 
 
20
 
 
 
 
 
20
 
 
 
 
16
 
17
11
 
 
11
10
 
 
 
 
 
11