Logicville - Educational puzzles, brain teasers, and word games such as anagrams, cryptograms, alphametics, doublets, tangrams. Brain Teasers and Maths Puzzles - Interactive logical and mathematical puzzles with feedback and detailed solutions. The Contest Center - Classic puzzles and riddles requiring only simple logic and elementary math. Alien Tiles - Object of puzzle is to try to get color pieces to create certain patterns in cube. Nick's Mathematical Puzzles - A collection of puzzles, with hints, solutions, and links to related mathematical topics. Mathpuzzle.com - Celebrates math puzzles and mathematical recreations. A+ Math - Interactive math help for K-12 students with flashcards, Math Wordfind, Homework Helper and worksheets. Scott Kim - Puzzles for web, computers, and print; ambigrams. Pythabacus - Description and instruction of using the ancient Pythagorean Abacus to do arithmetic. Mathwizz - Interactive math problems for abilities ranging from middle school to university. Mathschallenge.net - A website dedicated to the puzzling world of mathematics, with a discussion forum. The Puzzling World of Barry R. Clarke - Brain teasers, articles and puzzles forum. Brain Teasers by QBrute - Original brain teasers with solutions. Magic Math Kingdom - Learn math through games and quiz-oriented tutorial. Mixed Up Math - Logic problems, where equations are mixed up. In various formats like boxes, crosses, diagonals, mazes. Free download. Wu's Riddles - A collection of riddles, puzzles, and technical interview questions, with a discussion forum. Mathematical Recreations - Detailed exploration of a selection of mathematical topics. Paul Hsieh's Puzzles - Logical and mathematical brain teasers, with an indication of difficulty. Hints are provided; solutions are available by email. Torus and Klein Bottle Games - Collection of Java-based educational puzzles. Math Puzzles - Logic puzzles and riddles with some solutions. Alphametic Puzzles - Numerous puzzles, links, puzzle solver, and a generator. Contest Center Cryptarithms - Examples of cryptarithms, with prize competitions for subscribers. Algebraic Math Puzzles - A collection of puzzles at high school level. Does not include answers. Free Puzzle Collections - Educational and recreational puzzles for teachers, students and parents. Each puzzle is graded by difficulty and has a hint. Solutions are available to members. Aha! Puzzles - Puzzles, books, games and tests with designed by Lloyd King, author of "Test Your Creative Thinking". Nick's Mathematical Puzzles - A collection of puzzles, with hints, solutions, and links to related mathematical topics. Puzzle of the Week Archives - A collection of puzzles, with hints and full solutions. Compiled by George Moody. Polyhedra Links - Pastime and activity links for various geometric patterns, polygons and polyhedra by Jill Britton. Mathschallenge.net - A website dedicated to the puzzling world of mathematics. Group Games - Animations that develop the theory behind such puzzles as the Rubik cube. Downloadable and online games - A variety of Flash- and Java-based games and puzzles. Interactive Mathematics Miscellany and Puzzles - Java-based math resource including articles, puzzles and links. The Little Math Puzzle - The Little Math Puzzle has been a K-12 Internet activity since 1995 for grades 5-9. Currently the puzzles have ceased but the site maintains complete archives of past problems. Dick's Math Puzzle Page - A collection of mathematical puzzles, some original, with fully worked solutions. Creative puzzles - Interactive puzzle archive with descriptions for puzzle construction and a special children's puzzle page. Storkey: Two Envelope Paradox - A tough but simply defined problem which demonstrates key issues in probability. Project Eureka - A collaborative environment for math problem solvers and submitters. Wide range of math and programming problems, interview tests, and trivia questions. Missouri State University's Problem Corner - Math problems in three levels of difficulty: high school, advanced, and challenge. With archives. Sequence Puzzles and Problems - Find the next entry in each sequence. With links to related sites. Compiled by Torsten Sillke. Mr Titen's More Than Math - Mathematics teacher provides puzzles and games for students. Hot Pepper Math Puzzles - Fun, interactive brain teasers you can play anywhere. A Cleverly-Titled Logic Puzzle Blog - A large and varied collection of puzzles by logicsmith Grant Fikes. Alphametics and Cryptarithms - Puzzles in which letters or symbols are substituted for the digits in an arithmetical operation like addition. Alphametics Page - Compiled by Mike Keith. Examples of various genres. Colorful Mathematics - Educational software presents advanced mathematics to K-12 students in a game-oriented approach, using coloring and drawing techniques to illustrate concepts from graph theory and computer science. IQ Flash: Online games, puzzles - New printable puzzles, math games, board games, and logic games in flash.