网站简介：Type in a word and search many dictionaries at once. Also has a reverse dictionary and translations.
网站简介：A crossword solving search engine with a reverse feature that lets you see other clues pointing to an answer.
网站简介：Simple web-based letter pattern searcher.
网站简介：Nonstop fun with the world's best logic puzzles: free online picture-forming logic puzzles
网站简介：Official competitions, world records, top persons and stats by the official Cube association.
网站简介：Collection of crossword solving tools and crossword thesaurus to help fill in the blanks in crossword puzzles.
网站简介：Forum dedicated to speedsolving the Rubik's cube, asking questions, and cubers community.
网站简介：Brain teasers, puzzles, riddles, games and optical illusions.
网站简介：Includes brain teasers, riddles, paradoxes and optical illusions.
网站简介：Contains a huge collection of user submitted and rated brain teasers and riddles. It also has a lively message board and some unique multiplayer games.
网站简介：The official Rubik's site provides forum, online cube and games, contests, and history.
网站简介：Daily Calcudoku (sizes 4x4 to 12x12) puzzles which can be solved for points.
网站简介：Play sudoku puzzles online for free.
网站简介：Large riddle database categorized by difficulty. Includes a search feature.
网站简介：Puzzles playable online, sizes 3x3 to 9x9, as well as tutorials and tips.
网站简介：Use our free crossword puzzle solver. Crossword clues and answers gathered daily. Guaranteed to find any answers for any crossword puzzles.
网站简介：killer sudoku and greater than sudoku puzzles from easy to very difficult. New puzzles every day. Play on-online or download for off-line play.
网站简介：Makes wire puzzles of various levels of difficulty.
网站简介：Online Rubik's Cube timer for speedcubing. Scrambling generator, allowing inspection, calculating averages and other stats.
网站简介：Logical and lateral type thinking riddles with answers.
网站简介：This site contains logical puzzles. It contain puzzle types which appears in World Puzzles Championships. This site also contains Sudoku types which appears in World Sudoku Championships.
网站简介：Interactive java puzzles and activities in different mathematical topics.
网站简介：Interactive illusions, including Benham's disk and other illusions involving motion.
网站简介：Search by clues, word lengths, or partial words with wildcards.
网站简介：Home site for the Binary Arts line of mind puzzles.