Math puzzle collection to develop spatial reasoning skills. - Title: Spatial Mystery Puzzles to Develop a Math Brain - Target age: Elementary school grades 1-6 - ISBN: 9784794717448 - Contents: Puzzle book with many spatial problems - Authors: Masanobu Takahashi, Kayo Hiratsuka Thank you for viewing. No writing inside. There are some minor scratches on the cover and dust jacket. Please consider if you don't mind. We offer a discount of 100 yen per book when purchased with other books. Please comment before purchasing.