Killer Sudoku, Difficulty 10

Puzzle 6169 Oct 23 October 2012
Puzzle 6174 Oct 24 October 2012
Puzzle 6179 Oct 25 October 2012
Puzzle 6189 Oct 27 October 2012
Puzzle 6194 Oct 28 October 2012
Puzzle 6199 Oct 29 October 2012
Puzzle 6209 Oct 31 October 2012
Puzzle 6224 Nov 3 November 2012
Puzzle 6229 Nov 4 November 2012
Puzzle 6234 Nov 5 November 2012
Daily Killer Sudoku