Find K'nex building set instructions on Knex.com by scrolling to the bottom of the page and clicking the link labeled "Building Instructions" in the website's footer. Search using the 5-digit model number of the set on the front of the box.
Each K'nex set includes a printed copy of instructions. In addition to replacing the printed instructions that come with each set of K'nex, the online K'nex instructions library allows users to find projects that call for pieces the builder already owns. The K'nex website also offers instructions for bonus projects that aren't sold in stores also made from pieces the builder already owns.