Killer Sudoku, Difficulty 3

Puzzle 6472 Dec 21 December 2012
Puzzle 6482 Dec 23 December 2012
Puzzle 6492 Dec 25 December 2012
Puzzle 6502 Dec 27 December 2012
Puzzle 6512 Dec 29 December 2012
Puzzle 6522 Dec 31 December 2012
Puzzle 6527 Jan 1 January 2013
Puzzle 6537 Jan 3 January 2013
Puzzle 6547 Jan 5 January 2013
Puzzle 6557 Jan 7 January 2013
Daily Killer Sudoku