For children 8 to 12 years old, Mark makes each item a little bit more challenging—just like a good puzzle. However, it comes with a video of Mark Rober guiding children through each step in addition to step-by-step illustrations in the instruction manual. To ensure that each toy is a smooth and pleasurable build, each kit is extensively tested with children aged 8 to 12 and prototyped for months. Children can effectively and independently construct and play with the Build Box with the help of the instructional video, instruction manual, and a dash of persistence.