Hi Steve,
Great questions!
The game comes with 300 puzzles: 100 Beginner puzzles, and 50 each at the Easy, Moderate, Difficult, and Fiendish levels. I think you'll find that the puzzles are much more interesting to solve than puzzles that are randomly generated by other games.
You can download additional puzzle packs on the
Puzzle Pack download page (currently about 400 additional puzzles available at various levels), and from the
Puzzle Packs Forum.
For advanced users, the Puzzle Packs Forum also contains a downloadable utility that will convert a number of puzzle pack file formats into a Smoresoft Sudoku puzzle pack.
Regarding your second question, there is currently no setting to turn off the guidelines (the vertical and horizontal lines).
The guidelines are intended to make it easier to spot the currently selected cell, not really as an assistance feature, but I can see that it might be nice to turn them off. I'll submit this feature request for the next release of the game.
If you're really motivated, you could make the guidelines invisible by creating your own theme and specifying a transparent "guideLine" color (see
How to create a theme). You're welcome to try this without having to register first.
-David