Here’s my solution (it’s the one from the book):
And here’s the link:
http://www.lodev.org/jstumble/?board=rlerlf0fe00flxreell0rerril0elllll00000rrlrlle
Description: This one’s all about cramming everything you need into a small space. The bits are all there to create the 6 different paths needed to flip all 5 bits and drop the last ball into the interceptor.