I have JJCD and the JJ1 Shareware, and in both of them, Tubelectric 2's end sign is pretty much right after the bonus gem. In JelZe's JJ2-tileset conversion and this speedrun, the endsign is replacd by a checkpoint and the level continues on for a while afterwards, though in a rather strange way that looks different from the rest of the level. Could someone fill me in on the story behind these alternate endings?