Sudoku @ sz.dk

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

Estimated difficulty: 7.5 (<8: low, >45: high)