From tangrams to cryptograms, exercise your mind with clever puzzles and brainteasers. What new puzzles would you like to try?

What's the world's hardest puzzle?

Many puzzles can stump even the smartest players. But which head-scratcher is the hardest in the world?

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  • 3-D Puzzle Quiz

    3-D Puzzle Quiz

    A good puzzle is part problem-solving and part magic. In the following quiz, we test your knowledge of some of the world's most mystifying 3-D puzzles. Are you ready to get stumped? See more »

  • 5 Addicting Puzzle Games

    5 Addicting Puzzle Games

    There are some games that you play and forget about, while others suck you in and keep you coming back for more. We take a look at 5 highly addicting puzzle games. See more »

  • Cryptogram Quiz

    Cryptogram Quiz

    Cryptograms have been used for centuries by world leaders, clandestine lovers and anyone wishing to keep something under wraps. Test your knowledge of cryptograms as well as your skill at solving them. See more »

  • Cryptoquote Puzzles Quiz

    Cryptoquote Puzzles Quiz

    Cryptoquotes are fun word puzzles, but how did these brain games get their start? Take this quiz to test your knowledge about cryptology and how to solve cryptoquotes. See more »

  • Futoshiki Puzzle Quiz

    Futoshiki Puzzle Quiz

    How much do you know about Futoshiki puzzles? Put on your thinking caps and work your way through our quiz. See more »

  • How 3-D Puzzles Work

    How 3-D Puzzles Work

    As fun as they are, most traditional puzzles can fall a little flat. However, 3-D puzzles – made from plastic, wood, fabric and more -- have been boggling minds for centuries. What separates 3-D puzzles from their two-dimensional brethren? See more »

  • How 8 Queens Works

    How 8 Queens Works

    While 8 Queens is popular with the programming set, the less math-savvy among us can also squeeze some fun out of this classic puzzle. See more »

  • How Acrostic Puzzles Work

    How Acrostic Puzzles Work

    Word games can be fun (and frustrating) forms of entertainment, but if you're tired of the same old crosswords, why not try your hand at their puzzle cousins, acrostics? See more »

  • How Chess Puzzles Work

    How Chess Puzzles Work

    If you love the challenge of chess and can't get enough of the game, you can try out special chess puzzles to improve your skills. See more »

  • How Cryptograms Work

    How Cryptograms Work

    First used for confidential messages during times of war, cryptograms have now evolved into leisure-time puzzles. What are some of the keys to breaking the codes? See more »

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