Sudoku @ sz.dk

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

Estimated difficulty: 16.8 (<8: low, >45: high)