It is a fully functional pinball machine, and easily one of my favorite knex builds. though it uses lots of pieces, it is worth it (unless you have to build a small one). now be warned, i do not have step by step instructions since anyone who makes this will change it for there liking. the design is made so that you could make it as big or as small as you want it. because of this i only have clear pictures of everything already connected to the pinball machine(everything expect for part of the flippers and the track for the ball launcher are out in the open anyway, and easily seen). i have a description of each piece in the instructable and how it works so you can make it. everything is customizable so yours will most likely be different. but i still have a piece list to give you some idea of what yours will use.
_Kira_ made this using minimal white connecters, and made instructions here: www.instructables.com/id/Knex-Pinball-Machine-1/