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This site demonstrates modern web standards in action. It makes use of many advanced features including:

These features require a modern web browser such as Mozilla Firefox or Google ChromeOpera and Internet Explorer 9 will also work with most of the puzzles but don't yet support all the features that this site uses. Your mileage will vary using low-resolution screens, mobile browsers, or touchscreen interfaces. Older versions of Internet Explorer will fail miserably and will never be supported.

The sudoku puzzles were created using Stephen Ostermiller's free QQwing Sudoku generator.

The hitori, mathdoku, polyomino, and illumination puzzles were created using the free Singles, Keen, Filling, and Light Up programs from Simon Tatham's Portable Puzzle Collection.

The jigsaw and sliding tile puzzles use royalty-free images hand-picked from stock.xchng. Credit and appreciation is due to the following photographers:

The wordplay puzzles make use of the Enhanced North American Benchmark Lexicon, millennial edition (ENABLE2K). This word list is free and available in the public domain. Credit is due to all of its contributors, particularly Alan Beale and Mendel Cooper.

All puzzles except the jigsaw can be printed out and played by hand.

Visitors don't need to register to play any of the puzzles on this site. The only benefit to registering is that your solution history will be saved and your fastest times will be visible on the records page. Whenever you're logged in, all of your solved puzzles will be indicated by a checkmark, as seen to the right.