Killer Sudoku, Difficulty 10

Puzzle 6414 Dec 9 December 2012
Puzzle 6419 Dec 10 December 2012
Puzzle 6424 Dec 11 December 2012
Puzzle 6434 Dec 13 December 2012
Puzzle 6444 Dec 15 December 2012
Puzzle 6454 Dec 17 December 2012
Puzzle 6464 Dec 19 December 2012
Puzzle 6474 Dec 21 December 2012
Puzzle 6484 Dec 23 December 2012
Puzzle 6489 Dec 24 December 2012
Daily Killer Sudoku