Sudoku @ sz.dk

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

Estimated difficulty: 25.8 (<8: low, >45: high)