[.ca] Game, Set and Math: Enigmas and Conundrums (ISBN 0486458849)

Interesting but difficult:
The book is a set of puzzles for the reader to solve, often involving a family of worms that have to split a blanket, cut a cheese, or some other commonplace task that nonetheless can take mathematics to solve in the required way. The author originally wrote the puzzles for the French edition of Scientific American. Some of the mathematics involved is the standard (but interesting) pop-math like games with infinity, but others get into topology and higher mathematics. While many of the puzzles are quite interesting, a few will lose the casual reader (even the well-informed casual reader.) Nevertheless, the pleasure of sticking it out for the good ones repays the pain.