A problem book for training logical thinking, designed to bring out your intelligence. I bought it but haven't read it, and it's been stored in a dark place with a cover. The obi (sleeve band) is also included. I am selling it as new and unused. - Title: Logical Thinking Problems That Only Smart People Can Solve - Author: Hiroyuki Nomura - Publisher: Diamond Inc. - ISBN: 9784478119044 - Price: 1980 yen (tax included)