This cargo truck is a nine part puzzle (with all those boxes) that rewards your child with a working cargo truck. The boxes have lids that come off so you can stash treasure inside. They also stack on top of each other so they can be stacked up and knocked down. This stem educational toy truck encourages early childhood development of problem solving, creative play, and fine-motor skills in kids aged 3 . - Sustainable packaging made of recycled cardboard, doubles as a storage container.