I have created a 10 book library for everyone. It is a combonation of medium(2) and hard(8) puzzles.
You can download them here http://bluecollarweb.net/sudoku
Just right-click on the zip file and select "Save as".
Enjoy!
. . 7 | . . 6 | . . .
. . . | 7 1 . | 5 . .
9 . 5 | . . 2 | . . 8
-------+-------+------
2 . 1 | . . . | . . .
3 . . | . . . | . . 6
. . . | . . . | 7 . 9
-------+-------+------
5 . . | 6 . . | 9 . 4
. . 9 | . 2 1 | . . .
. . . | 5 . . | 3 . .
. 3 . | . . 1 | . . .
. 5 . | . . . | 3 . .
2 . . | . 7 . | . . 9
-------+-------+------
. . 9 | 6 . . | . . .
3 . 2 | 9 . 5 | 6 . 7
. . . | . . 8 | 4 . .
-------+-------+------
7 . . | . 2 . | . . 4
. . 6 | . . . | . 8 .
. . . | 5 . . | . 2 .