Here's an interesting one. Encouraged by the success of his earlier pinball machines, young humanoid made another machine. This one was a complete failure. The ball-releasing mechanism was unreliable, the scoring mechanisms were impossible to trigger and it did not have a working program. But, it was notable that young humanoid used both the RCX and the NXT in this project, as well as the fact that he called the previous machines "Ultra Pinball Machines" while he called this one "Ultimate Pinball Machine!"