3D wood model kits by UGears, Robotime, and others. Some are static, but many are interactive and actually do something. Most assemble without glue or tools.
We've selected specific models we find challenging, interesting, and just plain cool, and since we assemble all samples ourselves can offer insights into the building process.
If you can follow instructions to build Lego, you can assemble these kits. However, since the build process can be lengthy, and finger strength is needed, we recommend them for adults and teens 14 and up.