Sudoku @ sz.dk

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

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