Roy Leban did puzzle #16 in this crossword collection from the New York Times.

Quoted: Amazon.com: The New York Times Will Shortz Presents I Love Crosswords: From the Pages of The New York Times (Will Shortz Presents...): The New York Times, Will Shortz: Books

I finally got around to posting a sample Whodoku puzzle. Enjoy!

Quoted: Whodoku - Sudoku with Personality by Roy Leban. Famous names and intriguing riddles add spice to these popular sudoku puzzles. Sterling book by Roy Leban. Similar to Wordoku and Letter Sudoku.

There are only 5 billion essentially distinct Sudoku puzzles (solutions) (proof here using Group Theory and Burnside's Lemma).

My first puzzle book just came out.

Read my blog post on thistangent.com for some more information.

Quoted: Who knew that sudoku could have so much personality? They can—when famous names and intriguing riddles add spice to these popular puzzles. Here’s how it goes: on top of the page is a fun, partially completed clue about an unnamed person; for example, “He was in _____ for 27 years before being elected president.” There’s also a series of nine letters to use in solving the “who-doku,” and the grid itself has a number of circled spaces, as well as shaded areas. When it’s totally filled in, the circled letters provide the answer to the clue, while the shaded ones reveal who the person is. So the solution to the question above is, “prison” and the man is question is Nelson Mandela.

Article by Ed Pegg where he calls DROD (Deadly Rooms of Death) the best puzzle game ever.

Interesting article on rating the difficulty of Sudoku's and various solving methods (including a short backtracking program written in Ruby).

Quoted: jigsaw puzzle furniture