Killer Sudoku, Difficulty 3

Puzzle 3538 Jun 3 June 2011
Puzzle 3543 Jun 4 June 2011
Puzzle 3548 Jun 5 June 2011
Puzzle 3553 Jun 6 June 2011
Puzzle 3558 Jun 7 June 2011
Puzzle 3563 Jun 8 June 2011
Puzzle 3568 Jun 9 June 2011
Puzzle 3658 Jun 7 June 2011
Puzzle 3663 Jun 8 June 2011
Puzzle 3668 Jun 9 June 2011
Daily Killer Sudoku