There was a 5.4 earthquake here in southern California today, and it had a curious effect:

All the heavy black areas were knocked off of my Kakuro puzzles. While they are slightly less attractive, I’m told they use up considerably less ink and toner this way, so I guess I’ll keep ‘em. I hope [...]

The Spinning Oracle is a magic trick derived from my Wheel of Lunch project that wlil give you about 60 seconds of amusement.
The effectiveness of magic is greatly reduced when tricks are performed more than once — so try to resist the temptation to view the trick twice. Instead, share it with a friend!

If you’re interested in the puzzles on this website, and would like to learn more about what goes into making them, you may enjoy the article I wrote for this month’s Mung Being magazine, where I am the resident puzzle constructor.
The article amounts to a FAQ, or IAQ (infrequently asked questions) for the puzzle section. [...]

About 18 months ago, I was contacted by a publisher, Ulysses press, that wanted to put out some Kakuro books, and I provided enough puzzles for three books.
Like most small publishers, Ulysses was blindsided when the Sudoku craze hit, and didn’t manage to get any books in the pipeline before the market was glutted with [...]

Here are some new puzzles I’m working on.
These twelve Slitherlink puzzles use the aperiodic five-fold tiling discovered by Sir Roger Penrose. Not only are the puzzles pretty, but the tiling creates a variety of intersections, which makes the puzzles more interesting.
Download ‘em here…
Thanks to Craig Kaplan for providing the dataset for the tiles!

I’ve been enjoying Slitherlink puzzles lately, and thinking about publishing some variations. Below is a Slitherlink puzzle on a Hexagonal grid I made recently. This tiling makes it more complex in some ways, and easier in others.
More importantly, from my point of view, it’s round. Always a good thing in [...]

Slitherlink is an addictive logic puzzle that was first published by Nikoli in Japan. The puzzle consists of a grid of dots, with some clue cells containing numbers. You connect horizontally or vertically adjacent dots to form a meandering path that forms a single loop or “Slitherlink.” The loop must not have any branches and [...]

I’m working on some new puzzles and thought I’d give you a preview…
For the kids, I’m adding a new collection of mazes in a variety of animal shapes, such as this elephant.
For the non-kids, I’m adding some new logic puzzles, based on my favorites from Nikoli, the Japanese publisher that popularized Sudoku. One of [...]

I like to do crossword & sudoku puzzles, but I have this odd notion that puzzles which are printed in today’s paper are more fun than puzzles which are collected in books. I don’t know why.
I thought other people might suffer from this same ailment, so I set up a Daily Sudoku page, [...]

A few folks have written asking for more easy sudoku puzzles, so I’ve added two new sections to the site:
More Easy Sudoku
More Intermediate Sudoku
Each section contains 800 new puzzles.
Enjoy!