Sudoku @ sz.dk

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

Estimated difficulty: 13.7 (<8: low, >45: high)