I bought the 2-5 box for my 3 year old granddaughter. I was at her house when the second box arrived. She ran screaming through the house saying “My green box is here!!” This enthusiasm was matched when she opened the box. We started on the water bag/pencil activities and she was immediately enthralled. During the next few days we did most of the activities. They were exceptional!!! She was engaged in every activity and enjoyed checking on the growth of the animals over several days. Outstanding activities, great descriptions and explanations!! Highly recommend!!