Weekly Extreme Killer Sudoku Competition for Dec 9 to Dec 15

Number 638, Extreme
by Crosswords Ltd. December puzzle packs Now Out!. Thanks for supporting our site.
All entries must be in by the end of Saturday, Dec 15 23:59 EST, USA

1 2 3 4 5 6 7 8 9
A
B
C
D
E
F
G
H
J
20
 
5
11
11
19
9
 
20
 
 
 
 
 
 
11
 
 
14
14
9
 
 
 
 
5
 
 
 
18
 
35
 
10
 
11
6
 
 
 
 
 
11
21
 
 
11
 
 
 
 
 
 
8
12
 
8
16
13
9
 
 
 
19
 
 
 
 
12
15
16
 
 
6
 
 
 
 
 
 
 

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