The second volume of Trividoku is now available. Trividoku #2 contains 100 new trivia based Sudoku puzzles together with a full round of bonus puzzles: Stars & Stripes, Sudoku Islands and Sudoku Earthquake.

Sudoku Earthquake is now available on Amazon - although for some reason the cover image isn't appearing.

Get ready to shake up your Sudoku entertainment in the new Sudoku-USA book, "Sudoku Earthquake". We expect the book to be available in August 2009 with sample games online soon afterwards.

When playing the sample Sudoku Island puzzles, you can now change the background colors. This can make the puzzles easier to see on some screens.

You can now get to the puzzles from www.sudoku-usa.com in addition to www.sudoku-usa.net.

We've added a few more Trividokus for your puzzling pleasure. Enjoy!

We've added a new links page to the site, pointing to some of our favorite Sudoku sites.

Microsoft has released the final version of Silverlight v2.0. Silverlight is what we use for running the sample puzzles and is similar to Flash.

We now have the initial version of the playable Stars & Stripes, Sudoku Islands and Trividoku puzzles online. These use Microsoft Silverlight v 2.0 beta - sort of Microsoft's answer to Flash programs - so things are 100% perfect yet. They've been tested under Internet Explorer 7 and Firefox 3, but there are known problems with some earlier browsers.

Give them a try and see what you think!

For you Trividoku fans, currently we only have two puzzles available to play, but we'll have more online soon.

Sudoku Islands is now available online at Amazon.com.

Flying Duck Computer (publisher of Sudoku-USA books) has moved. Our new address is: 2450 Central Ave Ste D, Boulder CO, 80301. All other contact information remains the same.

Our new web site is now online. We're hoping to have the ability to play different puzzles online soon. Until then, we have samples for all of our books in print.

Stars & Stripes Sudoku is now available on Amazon.com.

Oops - on page 97, "Roger Young" should actually be "Rodger Young" (with a 'd').

Trividoku is now available on Amazon.com.