Killer Sudoku, Difficulty 7

Puzzle 15419 Nov 6 November 2017
Puzzle 15429 Nov 8 November 2017
Puzzle 15499 Nov 20 November 2017
Puzzle 15509 Nov 22 November 2017
Puzzle 15539 Nov 28 November 2017
Puzzle 15579 Dec 6 December 2017
Puzzle 15599 Dec 10 December 2017
Puzzle 15609 Dec 12 December 2017
Puzzle 15619 Dec 14 December 2017
Puzzle 15649 Dec 20 December 2017
Daily Killer Sudoku