Weekly Extreme Killer Sudoku Competition for Dec 23 to Dec 29

Number 640, Extreme
by Crosswords Ltd. March 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
15
 
 
20
13
 
 
23
 
12
3
 
 
 
10
 
 
 
 
 
8
13
18
11
 
20
 
5
 
 
 
 
 
14
 
9
21
 
8
13
 
 
 
 
 
 
14
 
19
 
7
11
6
 
 
 
9
 
 
 
 
15
11
18
14
 
 
17
 
 
 
 
 
 
16
 
 
 
12