This is the place where the gimmicks and the themes ramp up some. Also I did a lot of small fixes to get the lua in these levels to work on the latest SMBX, as well as lot of graphical work. Especially the "Cat Planet" level had a graphical overhaul.
As a reminder, many of these levels were made on the old SMBX editor, and use various tricks/hacks to make the graphics work. I encourage people to look into the level files and see how everything works.