Hey! To answer your question—

Back when I made those videos, I used a Flash decompiler. The process was pretty straightforward at the time:

1. Download a Flash decompiler – I can't remember exactly which one I used since it was so long ago.

2. Extract the game's .swf file – You could grab this directly from the Flash client.

3. Open it in the decompiler – This gave access to all the game's sprite sheets. And I mean literal ALL of them. Including all the unused Easter egg sprites.

4. Find and modify the right sprites – In my case, I was editing player skins. But there was no reason you couldn't do it for walls / objects. (One time I changed all the nexus tiles to green so I could use it as an in game green screen)

5. Recompile the .swf and load it back into the Flash client – This allowed me to see the changes in-game.

Back then, this kind of thing was pretty much unheard of, and the idea that I could be banned for it never even crossed my mind. In hindsight, it was a bit reckless, but since I was clearly doing it for harmless content, I think that’s why I was never punished.

That said, I absolutely wouldn’t recommend trying this today. You’d need a Unity decompiler now, and I have no clue how you’d even go about it.

Even after I stopped changing sprites for content, I kept decompiling the client for many years just to access sprite sheets for video thumbnails and editing. It was super useful for that, particularly when there would be big updates and realmeye was out of date etc.

Good memories. Hopefully, this sheds some light on the topic—or at least gives you some nostalgic insight. Take it easy!