If you have had fun in solving puzzles, if you like to entertain your friends with puzzles and mental gymnastics, this is your
kind of book. Here you will find easy ptizzles, hard puzzles, puzzles
useful and amusing, puzzles for beginners and puzzles for old-
timers, puzzles to challenge your logic, your ingenuity, your
knowledge. Some of these puzzles are old favorites; many of them
are new ones invented by the author.
The primary object of the book is to entertain. To solve many
of the puzzles, you need no knowledge of mathematics other than
simple arithmetic. Other puzzles require a knowledge of
elementary algebra and plane geometry. Some of the puzzles are
solved for the reader in the text, in order to show how to attack
more complex puzzles of the same type. Answers to all puzzles
are given on pages 139-235, and here the full method of
solution is explained for all the more difficult puzzles.