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A car dealer sells two cars for $9,999 each -- one at a 10% profit, the other at a 10% loss. Overall, did the dealer make or lose money?
How many common words of six letters can you make from machine, using each letter only once per word?
Raoul asked his brother's wife's mother-in-law's only husband's only daughter to join him and his wife for lunch. What relation is she to Raoul?
Decipher hidden quotes, reposition matchsticks to form equilateral triangles, navigate complex mazes, and solve scores of other intriguing challenges with this puzzle treasury. The third in a...

This collection of more than one hundred original and highly sophisticated puzzles presents challenges that require creative, outside of the box thinking. Many different types of puzzles are included, such as word, number, logical, visual, spatial, dissection, dividing, dot-connecting, matchstick, coin, and more. Each aesthetically appealing puzzle is designed to improve problem solving skills; train geometric, combinatorial, and spatial imagination; bolster visual perception and logical reasoning; and foster the development of a perseverant and self-confident approach to challenges."

In a foot race, Abe was neither first nor last. Cal beat Doug, Bruce beat Abe, Abe beat Ed but was beaten by Cal, and Doug beat Bruce. Who was last?
Arrange four chess pieces so that every piece attacks exactly four empty squares.
In the USA, is it possible to travel by car in such a way that you visit exactly seven states and enter them in alphabetical order?
What do these words have in common: commerce, canoodle, funnel, recessive?
You have 12 pounds of nails and a large 2-pan balance. How can you measure out 9 pounds of nails?
Find identical jigsaw puzzle pieces,...

Multiplying my age by 6 then subtracting 6 produces the same result as subtracting 7 from my age then multiplying by 7. How old am I?
On my broken calculator with keys ] - x =, the only functional number is 7. How can I get 34 to appear in the readout?
A country mints four denominations of coins, in whole numbers of cents. It takes four of these coins to make 21 , or 24 , or 25 , or 26 . What are the denominations of the coins?
These and almost 300 other mathematical puzzles appear in this original collection, devised by world-renowned mathematicians, puzzle creators, and...