Title: Spatial Reasoning Pre-K & Up: Kumon Thinking Skills Workbooks, Author: Kumon Publishing
Title: Play Smart Preschool Prep! Puzzles Ages 2-4: At-home Write & Wipe Workbook with Erasable Pen, Author: Gakken
Title: Logic Pre-K & Up: Kumon Thinking Skills Workbooks, Author: Kumon Publishing