Killer Sudoku, Difficulty 10

Puzzle 8450 Jan 20 January 2014
Puzzle 8460 Jan 22 January 2014
Puzzle 8470 Jan 24 January 2014
Puzzle 8480 Jan 26 January 2014
Puzzle 8490 Jan 28 January 2014
Puzzle 8500 Jan 30 January 2014
Puzzle 8505 Jan 31 January 2014
Puzzle 8515 Feb 2 February 2014
Puzzle 8525 Feb 4 February 2014
Puzzle 8535 Feb 6 February 2014
Daily Killer Sudoku