Killer Sudoku, Difficulty 3

Puzzle 8488 Jan 28 January 2014
Puzzle 8498 Jan 30 January 2014
Puzzle 8513 Feb 2 February 2014
Puzzle 8523 Feb 4 February 2014
Puzzle 8533 Feb 6 February 2014
Puzzle 8543 Feb 8 February 2014
Puzzle 8553 Feb 10 February 2014
Puzzle 8563 Feb 12 February 2014
Puzzle 8573 Feb 14 February 2014
Puzzle 8583 Feb 16 February 2014
Daily Killer Sudoku