Sudoku @ sz.dk

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

Estimated difficulty: 19.8 (<8: low, >45: high)