Killer Sudoku, Difficulty 3

Puzzle 3490 May 24 May 2011
Puzzle 3495 May 25 May 2011
Puzzle 3500 May 26 May 2011
Puzzle 3505 May 27 May 2011
Puzzle 3510 May 28 May 2011
Puzzle 3515 May 29 May 2011
Puzzle 3520 May 30 May 2011
Puzzle 3524 May 31 May 2011
Puzzle 3528 Jun 1 June 2011
Puzzle 3533 Jun 2 June 2011
Daily Killer Sudoku