In this series of adicting puzzles you use a mechanical scarab to push all the gems into the hole. Many puzzles are provided. Play it here on the Web!

An elegant but difficult logic puzzle. The Kol tribe has a treasure inside of a statue that can be opened only when the correct sequence of color stones is placed before it. Can you use the five "Laws of the Kol" to find the sequence? It seems unlikely, yet the Kol tribal chief is worried that you can. (Windows)

   

Classic and new sliding-block puzzles that you can work here on the Web. Difficulty ranges from tricky to nearly impossible.

A web-based viewer for displaying chess positions. You can send a chess position or problem as a simple string of text in e-mail messages and newsgroup posts. The recipient can view a board, like that shown here, with a single click of the mouse. This Java applet makes it unnecessary to draw, send and decipher crude diagrams.

8/8/2Qp2K1/4k3/4N3/6p1/2R5/8 becomes:




Example of a Quine -- A Self-Replicating Computer Program

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