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  2. 25 Printable Brain Teasers You Can Print for Free - AOL

    www.aol.com/25-printable-brain-teasers-print...

    How many of these brain busters can you solve? The post 25 Printable Brain Teasers You Can Print for Free appeared first on Reader's Digest.

  3. Category:Games of mental skill - Wikipedia

    en.wikipedia.org/wiki/Category:Games_of_mental_skill

    Print/export Download as PDF ... The Game (mind game) Gamestar Mechanic; Gin rummy; ... Mental calculation; Mental-skill game; MetaZoo; Mind map; Mind Sports South ...

  4. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Mental calculation consists of arithmetical calculations using only the human brain, with no help from any supplies (such as pencil and paper) or devices such as a calculator. People may use mental calculation when computing tools are not available, when it is faster than other means of calculation (such as conventional educational institution ...

  5. 24 (puzzle) - Wikipedia

    en.wikipedia.org/wiki/24_(puzzle)

    The original version of 24 is played with an ordinary deck of playing cards with all the face cards removed. The aces are taken to have the value 1 and the basic game proceeds by having 4 cards dealt and the first player that can achieve the number 24 exactly using only allowed operations (addition, subtraction, multiplication, division, and parentheses) wins the hand.

  6. Mental abacus - Wikipedia

    en.wikipedia.org/wiki/Mental_abacus

    Mental calculation is said to improve mental capability, increases speed of response, memory power, and concentration power. Many veteran and prolific abacus users in China, Japan, South Korea, and others who use the abacus daily, naturally tend to not use the abacus any more, but perform calculations by visualizing the abacus.

  7. Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

  8. Famous Trick Donkeys - Wikipedia

    en.wikipedia.org/wiki/Famous_Trick_Donkeys

    This time the mechanics of the game were the same as Sam Loyd's, other companies used a tiny card with this puzzle as a gift, like the Hotel Wellington in Albany in the 50s. "The Dead Dog Puzzle" Today, many puzzle and mind-teasers websites offer the puzzle as an online game or a print-friendly version of it.

  9. George Lane (mental calculator) - Wikipedia

    en.wikipedia.org/.../George_Lane_(mental_calculator)

    George Lane (born 1964) is a British mental calculator and author. He is a five-time gold medalist in the Mental Calculations event at the annual Mind Sports Olympiad , [ 1 ] [ 2 ] and is one of only five Grandmasters of Mental Calculation, [ 3 ] as recognised by the Mind Sports Organisation .