Puzzles & Games for Critical and Creative Thinking by June Bailey is a workbook for ages 4-6 year olds. Critical thinking skills are a must and this is just the workbook to get started. Each page indicates the specific thinking skill being developed such as: deduction, understanding relationships, sequencing, inference, and creative thinking. I like using this book as a tool to get my children interested in learning for the day. I will sometimes tape up a page to the white board and leave it there to see what questions my children ask me. They find them interesting and fun.