Are you in the US? Do you have a Kindle? If so then please support us and help us to continue to run sudoku.org.uk as a free site.
We have just released a number of titles for the Kindle. These are active content which means that you can play Sudoku on your Kindle with optional auto possibles and full access to pencil marks. We think it is really great and looks fantastic on the Kindle. Please take a look.