Killer Sudoku, Difficulty 3

Puzzle 4450 Nov 13 November 2011
Puzzle 4460 Nov 15 November 2011
Puzzle 4470 Nov 17 November 2011
Puzzle 4480 Nov 19 November 2011
Puzzle 4490 Nov 21 November 2011
Puzzle 4500 Nov 23 November 2011
Puzzle 4510 Nov 25 November 2011
Puzzle 4520 Nov 27 November 2011
Puzzle 4530 Nov 29 November 2011
Puzzle 4539 Dec 1 December 2011
Daily Killer Sudoku