The Star Bubble appears as 12th bubble on Puzzle mode under 2 conditions:
- continue once
- do NOT erase bubbles till 10th bubble shooting
It'll be big time shortening but like death abuse. Is it prohibited on the Puzzle category? (It should be written in the rule AAR)

in most cases this would likely cost more time than it saves, so i fail to see how this would improve times.

ignore the above comment, after watching the pending run i understand how broken it is, will be prohibited from now on.
please let me know if there are any runs that are currently accepted and make use of this, as i haven't noticed this before.

It sounds right.
I thought about category separation. (ex. "Puzzle - Star Abuse")
This technique will make another competitiveness.
How do you think about this?

I would be in favor of a separate category as a miscellaneous/niche. It might be neat to find a route between the 27 Stage worlds where it would be most optimal to use.