This book in the genre of unknown, a little about the book Brain Games - Over 400 challenging puzzles! This is more than your average puzzle book, this contemporary format comes with a pencil set inside the book within a specially made diecut. Without having to waste time looking for a pencil there'll be more time to puzzle your way through this great selection of mind-benders and brain-teasers. The seemingly difficult is often very simple so why not give it a try.