I'm about halfway through with Mario Bros. (bomb mode, all the ? block sequences, and castle sequences to go). It's taken a lot of time to understand the editor. It's very systematic. LOTS and LOTS of trial and error to see what works best. For the main part I've just been searching vpuniverse and reading the pin2dmd.com/editor page.
It took me a while to figure out how to get a single frame color mask to save. Ended up having to click copytonext/prev which causes a java error and then it saves or is retained. Then for whatever reason out of the blue my color palette indexes would be off by one but only when exporting to realpin. Everything in the XML everything was pointed to the correct color palette and in the editor when you look at it. Come to find out there was a duplicate color palette index and no clue how that happened. This is my experience thus far. It is a lot of fun, just takes a bit of time