Page of brain teasers profiles questions needing little thought to challenging ones that take hours, days or months to figure out.

Puzzle, game and toy developer offers retailer info, freebies and related resources for puzzle enthusiasts..

Contains 10 problems pertaining to numbers, logic, words and homophonetics.

Let the missing piece fall into place with this retail guide to puzzles and learning games.

Find puzzles related to numbers, language, logic and various other themes.

Collection of interactive puzzles and games. Some have ray-traced graphics and need Java, while others are 3D-rendered.

Features two Java-based puzzles. One is a classic sliding tile puzzle and the other is the game Mastermind.

Contains 10 brain teaser puzzles to solve, with answers located on a separate page.

Browse through a collection of Marilyn vos Savant's columns for Parade Magazine which show her original published answer to be wrong.

Find 10 puzzles to solve, many of which involve letter and number substitution. Answers are located on a separate page.

Select a puzzle from a menu which includes Times Square and other NYC landmarks. Puzzles are variations on the slide puzzle 15.

Pondering Page, created by Kent Oldham, offers quotes, questions and brain teasers to keep minds stimulated.

Find 10 logical, spatial, word-play and math-related puzzles to solve.

Devoted to puzzles, board games, trivia, books, software, and contests. Prizes of over $10,000 per month.

Puzzle fans will find a huge collection of puzzles, optical illusions, IQ tests, paradoxical problems and tips for solving them.

San Francisco-based developer of low-technology games showcases its Tangoes and Word Trek puzzles. Products are based on literature and myth.