Sudoku @ sz.dk

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

Estimated difficulty: 16.7 (<8: low, >45: high)