Killer Sudoku, Difficulty 3

Puzzle 4831 Jan 29 January 2012
Puzzle 4841 Jan 31 January 2012
Puzzle 4846 Feb 1 February 2012
Puzzle 4856 Feb 3 February 2012
Puzzle 4866 Feb 5 February 2012
Puzzle 4876 Feb 7 February 2012
Puzzle 4886 Feb 9 February 2012
Puzzle 4896 Feb 11 February 2012
Puzzle 4906 Feb 13 February 2012
Puzzle 4916 Feb 15 February 2012
Daily Killer Sudoku