网站简介：Optical illusions, 3D stereograms and anaglyphs, fractals and brain teasers
网站简介：Provides perplexing problems for puzzle lovers of all ages.
网站简介：Answers to technical interview questions, programming problems, and brain teasers.
网站简介：Descriptions of solving the classic Rubik's cube, focused on some exceptional methods as well as some common characteristics of many methods used by cube fans.
网站简介：Online word and anagram finder that uses the UK Advanced Cryptics Dictionary.
网站简介：Challenging puzzles and riddles and interactive quizzes and tests.
网站简介：two daily Sudoku puzzles (easy and medium), printable and solvable online.
网站简介：Offers many types of crossword puzzles, creation software, and solving tools.
网站简介：Impossible figures, optical illusions, multimedia and 3D puzzles.
网站简介：Many printable sudokus downloadable as PDF. New ones generated often.
网站简介：Create free word search puzzles to play online or print and share.
网站简介：Clean site with many puzzles at all levels, solvable online.
网站简介：Offers a different printable puzzle each day. Also includes solutions and FAQ.
网站简介：A collection of riddles and optical illusions of many different forms with thumbnail browsing.
网站简介：Crosswords and other word puzzles and games, samples; monthly puzzle magazine; 800,000 word searchable list.
网站简介：Creators of the stereogram craze of the '90s. A new image is posted weekly, and includes the answer.
网站简介：Offers thousands of puzzles ranging in size and difficulty. Site also offers a creator and a solver.
网站简介：Searchable online puzzle solver. Contains more than 235,000 entries, including names and movie titles.
网站简介：Classic puzzles and riddles sorted in several sections - general logic, weighing puzzles, Einstein's riddles, number sequences, and crossing river.
网站简介：Descriptions and solutions for many different types of Rubik's Cube puzzles including Square-One, Alexander's Star, Tricky Disky, and Rubik's Magic.
网站简介：Challenge your mind with free online riddles/puzzles, logic games, brain teasers and view optical illusions.
网站简介：A set of tools for searching words by letters. It can help to solve and compose crosswords, find words for Scrabble and anagrams.
网站简介：Solutions for the Rubik's Cube and many other mechanical puzzles. Post questions and get answers on the puzzle message board. Has a Puzzle of the Month page.
网站简介：Offers online and offline versions. Includes different styles such as alpha-cross, cryptic, and codeword.
网站简介：This downloadable software allows you to play with a 4D Rubik's Cube on your own computer. The software is Windows, Linux, and UNIX compatible.