Killer Sudoku, Difficulty 7

Puzzle 14422 Apr 24 April 2017
Puzzle 14452 Apr 30 April 2017
Puzzle 14462 May 2 May 2017
Puzzle 14552 May 20 May 2017
Puzzle 14572 May 24 May 2017
Puzzle 14617 Jun 2 June 2017
Puzzle 14647 Jun 8 June 2017
Puzzle 14687 Jun 16 June 2017
Puzzle 14727 Jun 24 June 2017
Puzzle 14737 Jun 26 June 2017
Daily Killer Sudoku