Math brain puzzle collection for children aged 5 to 3rd grade. It's been at home for a long time. There are no markings, but there is some yellowing due to aging. - Title: Arithmetic Brain Puzzle Nazo-P 1 - Author: Masanobu Takahama - Published: 2006 - ISBN: 978-4-7942-1509-3 - Target Grade: 5 years old - 3rd grade elementary school - Publisher: Soshisha Co., Ltd. Thank you for looking.