Sudoku @ sz.dk

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

Estimated difficulty: 4.5 (<8: low, >45: high)