When trying to do Eli's "Best Lab Practices" tutorial, the Next button presented at the end of each puzzle is not sending me on to the next puzzle within the tutorial. Instead, I find I need to go back to the Home page and restart the tutorial to get the next one in the progression.
I believe this is the case with all side projects which have their own set of puzzles. I definitely think that when you're working on them, next puzzle should bring you to the next in the sequence (this also opens the door to "puzzle quests" custom puzzle "playlists", and just customizing "next puzzle" in general which has been discussed before). Would also be nice to see a little bit more in the puzzle completion pane in the way of showing you what series you are currently working on, navigating to other tasks/series, etc.