Sudoku @ sz.dk

			5				1	7
	8			1			6	3	5
	1		9	6	3	5	8
	7	2			9	1			6
		9	1		5		7	2
	4			7	2			9	1
			4	9	8	7	5		3
	9	8	7			3			4
		1	3				9

Estimated difficulty: 13.7 (<8: low, >45: high)