Killer Sudoku, Difficulty 3

Puzzle 4647 Dec 23 December 2011
Puzzle 4657 Dec 25 December 2011
Puzzle 4667 Dec 27 December 2011
Puzzle 4675 Dec 29 December 2011
Puzzle 4678 Dec 29 December 2011
Puzzle 4687 Dec 31 December 2011
Puzzle 4692 Jan 1 January 2012
Puzzle 4702 Jan 3 January 2012
Puzzle 4712 Jan 5 January 2012
Puzzle 4722 Jan 7 January 2012
Daily Killer Sudoku