Neptune

Here wez go againz...

This was not originally the next planet track planned, but as I said before, been having trouble with camera zooms for that one. So I'll let Nepz be next until I get that issue ironed out. No camera zooms here, at least. So that'z all goodz.

GO_AWAY is included because he somewhat half-named one of the aliens. Plus, he just likes being menchenned.

More details on how to get the Practice Stars because they are very difficult to get, and I don't expect anyone to try.
But anyway:
For the first one, you'll need to perilously platform your way down the side of the track's outer section atop the floating spiral of frozen water, through the long, cold tunnel, and then ride a draft up to where one of the three groups of Tethercaps are. You'll find the star smack-dab in the middle. You might want to skip this one, even I haven't managed to get it yet, but it is possible.
The second one is suspended in the air in the cavernous area along the unused path before the short ice tunnel. You'll need to find a way up to the top of that portion of the track and drop down into one of the openings with ridiculous precision to get it.
The last one is more forgiving, but at the same time not. From the starting area, go backward and into the nesting place where several premature Ikandiz are. It's very dark here, but there are spotlights that indicate where they can see you. They are only an eye at this stage of their lives seen protruding out of crystalline-like pods. If yaz have trouble get'n throughz, youz can cheatz and go into Trigger Mode to find the pathz. Going through the other end is not safe, either.

https://www.youtube.com/watch?v=hBRuE-Ss9yw

Readmez iz what all true warriorz strive for~