Your favorite Sudoku websites should be listed here. Mine is <a href="http://www.sudopedia.org" target="_blank">Sudopedia</a><br>For a brand new variation: <a href="http://www.hanidoku.com" target="_blank">HaniDoku.com</a>
Here's a Sudoku puzzle with a stock market twist I worked on. Hope you enjoy it. The object is to arrange stock market ticker symbols instead of numbers.