There was a variant of the 15 number sliding puzzle[1] that I really enjoyed on my Palm Pilot and have never seen replicated since, except by myself as a hobby

There was a variant of the 15 number sliding puzzle[1] that I really enjoyed on my Palm Pilot and have never seen replicated since, except by myself as a hobby project, and I've long wished to know who authored it and what exactly the original mechanics were. Basically it just had a series of puzzles that got harder by adding special "walls" between tiles that either prevented movement or performed a reversible transformation on the tiles that passed through (invert colors, rotate by 90 degrees, embiggen/shrink the tile, I don't remember the exact details of the original game but those are the ones I used). Sadly it's not listed here, I'm curious if anyone knows what I'm talking about. [1] https://en.m.wikipedia.org/wiki/15_puzzle https://en.m.wikipedia.org/wiki/15_puzzle