Sudoku @ sz.dk

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

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