Killer Sudoku, Difficulty 3

Puzzle 4549 Dec 3 December 2011
Puzzle 4559 Dec 5 December 2011
Puzzle 4569 Dec 7 December 2011
Puzzle 4579 Dec 9 December 2011
Puzzle 4587 Dec 11 December 2011
Puzzle 4597 Dec 13 December 2011
Puzzle 4607 Dec 15 December 2011
Puzzle 4617 Dec 17 December 2011
Puzzle 4627 Dec 19 December 2011
Puzzle 4637 Dec 21 December 2011
Daily Killer Sudoku