A Library book called Time Trial 1 can now be downloaded from sudoku-com/libbooks.htm [ broken link ]
The Library book contains 10 puzzles: 2 Very Easy, 3 Easy and 5 Medium.
The idea is for you to work your way through the Library book, keeping a note of your solving time for each puzzle. When you have finished the book, add up your total time and post it in this forum ("Libary books"). You can see how your time compares to others'.
Library books can be used only with the Sudoku program from Pappocom. Read about the program at http://www.WayneGouldPuzzles.com/ or download it from http://www.WayneGouldPuzzles.com/sudoku/download/
For details on how to download the Library book, and what to do with it once you have, go to sudoku-com/libbooks.htm [ broken link ]