Math Puzzle (www.mathpuzzle.com)). Ed Pegg, a big-time puzzle designer, has spun a most ambitious homegrown web site with a new mathematical puzzle every week. Deep stuff, highly original, very visual. Keep your eyes on this one.

The Great Enigma Challenge (members.xoom.com/MissAnge1/weekly.html)). Solve a variety of puzzles set in amusing situations, while listening to music, and mail in your answers.

The Riddler (www. riddler.com). Play games (mostly trivia) to win prizes. Self-supporting based on advertising and prize sponsorship.

Smart Games (www. smartgames.com). One of the best new CD-ROM puzzle games has a web site where you can post high scores to compete for a large grand prize. There are also online versions of some of the puzzles, as well as downloadable demoes.

You Don't Know Jack (www.bezerk. com). This online version of the best-selling CD-ROM game is already attracting over 200,000 players a month. Features streaming audio and frequently refreshed content.

Obsidian web puzzles (www.segasoft.com/ obsidian). Twelve Shockwave puzzles to solve, based on the CD-ROM game of the same name.

The Case (www.thecase.com). Daily mystery stories to solve.

Crossword of the Day (www. quizmaster.com). Main audience is educators who want to use custom puzzles in their classroom to motivate students. The daily crossword puzzle helps attract traffic to this site. The puzzle is composed using Crossword Wizard, an excellent puzzle authoring program that can output complete Java puzzles to drop into web pages.

New York Times Crossword (www.nytimes.com). Subscribe for $9.95 a year to get downloadable versions of the daily newspaper puzzles.

Wizards of the Coast (www.wizards.com) Makers of the wildly popular collectible trading card game Magic the Gathering. Use free puzzles on the site primarily to drive sales of their physical paper products.

Cognitoy (www.cognitoy.com). A stand-in web page for an aspiring game designer.

Sparkling Light (www.sparklight.com). "Fun laced with learning."

E-on (www.e-on.com). Entertainment Online, European based. Major content aggregator with some games.

Random House (www.booksatrandom.com). As a big publisher of puzzle books, Random House has a full web site for puzzlers that includes member registration, contests with prizes, and bulletin board.

South Peak (www.southpeak.com) Jigsaw puzzles.

Treasure Hunts (www.treasurehunt.org). Live city-wide events that combine aspects of scavenger hunts and puzzle solving.

National Puzzlers League. Organization of about 500 puzzle solvers and makers. Mostly word puzzles.

Puzzle Zone (www.puzzlezone.com) Coming soon...

Set (www.setgame.com) Features daily puzzle based on the award winning card game of visual patterns. Also available as a computer game. Coming soon to a gaming network near you.

Wheel of Fortune (www.sony.com) Web version of the TV game show.

Zenda (www.zenda.com) This multimedia development company, which spun out of the Apple Multimedia Lab, is now staging web events using The Palace, such as a weekly comedy show, author readings, and a multiplayer game called Charebus (combines charades and rebuses).

Electric Communities (www.communities.com) The makers of the first visual MUD Habitat are now building new online communities. The web site features excellent papers on their experiences with online community issues, including stories of what happens when players collude to cheat on cooperative puzzles.

Tetra (www.tetra.com) Color matching game

The Sunday Puzzle (www.npr.org) Transcription of the weekly puzzle broadcast on National Public Radio every Sunday morning. Hosted by Will Shortz, puzzle editor for the New York Times.

Castle Infinity. Ambitious kid's graphic exploratory online environment, featuring multiplayer collaborative puzzles. From Starwave.

Catchword. From Kesmai.

Puzzle Zone (www.puzzlezone.com) Coming soon...

Gothic Windows. Color puzzle in Java.

MetaSquares. On AOL in the Games Channel. A 2-player board game with strong puzzle overtones.

E (www.e.com)

Gamelan (www.gamelan.com), a central site for Java developers, lists dozens of online games implemented in Java.

Macromedia Shockzone (www.macromedia.com/shockwave) lists dozens of sites that feature outstanding uses of Shockwave, including many games and puzzles.

Lightspan (www.lightspan.com). Educational games.