Weekly Extreme Killer Sudoku Competition for Feb 10 to Feb 16

Number 647, 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 16 23:59 EST, USA

1 2 3 4 5 6 7 8 9
A
B
C
D
E
F
G
H
J
11
 
 
14
 
21
17
 
7
20
 
17
 
 
 
14
 
 
 
 
 
 
20
13
 
7
5
14
9
9
 
 
 
 
 
 
 
 
 
14
 
 
13
11
10
10
9
11
 
11
 
 
 
 
 
 
12
 
 
12
 
29
 
9
 
 
20
 
15
 
 
 
 
10
 
 
 
 
11