Kiwi Crate entered the STEM education genre with the introduction of the Tinker Crate ($20 per month for three months) for kids ages 9 to 16 and up. These boxes are filled with projects that encourage problem-solving skills while kids create things like trebuchets and motors following step-by-step (and age-appropriate) instructions. While the projects sound complicated, they're anything but! They're designed to build confidence and encourage kids without frustrating them. Each month, a box will arrive with all the materials kids need to complete the project and a blueprint for getting there. An accompanying magazine, called Tinker Zine, features cartoon strips, science-based stories, and additional activities kids can do with their completed projects.