Sudoku @ sz.dk

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

Estimated difficulty: 4.2 (<8: low, >45: high)