Sudoku @ sz.dk

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

Estimated difficulty: 10.6 (<8: low, >45: high)