Sudoku @ sz.dk

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

Estimated difficulty: 7.6 (<8: low, >45: high)