Crunch Labs Build Box, great for kids 8-12+ year olds. -Boxes take 30-60 minutes to build and are meant to be challenging -Each box comes with a step-by-step illustrated instruction booklet along with a QR code that links video of Mark Rober (the creator) walking kids through each step. -Box has been opened and assembled but all parts have been accounted for when disassembled. Additional build boxes available.