# The Big Book of Brain Games

The Big Book of Brain Games is really big. It is over 400 pages long and contains 1000 puzzles of various types and difficulties. The puzzles are sorted in chapters based on their categories - Geometry, Numbers, Topology, Science, Perception, etc. Each of them is rated from 1 to 10 depending on how difficult it is. At the back of the book there is an index, which lets you find easily all puzzles of specific difficulty. Despite the huge amount of puzzles, there are just a few "real" brainteasers. The book consists mostly of problem exercises which require pen and paper in order to get solved. In order to give you an idea of what to expect, I have selected several puzzles from the book, which represent its overall level.

1. Many years ago a man married the sister of his widow. How did he do it?

2. Can you measure your weight anywhere in the universe using a spring scale?

3. A great number of birds sit randomly spaced on a wire, each watching its nearest neighbor. Not counting the two birds on the end of the wire, what percentage of the birds sits unwatched?

4. Using just a compass and a ruler, can you divide a circle into eight regions of equal area?

5. You see three faces on each of three dice, for a total of nine faces. If the sum of the dots on each die is different, and you see a total of forty dots altogether, then can you work out which faces must be visible on each die?

Even though TBBOBG did not offer many of the puzzles I enjoy solving the most - classical brain teasers, I can't deny that it is a high quality product and a great coffee table book. The sheer amount of content inside can provide countless hours of problem solving both for young and old.