Probably Lua, since old bp client used that as a programming language, but I wouldn't be surprised if they used C#, since the client is developed in Unity

If you look on the games page under "Script Editor" it says "A more in-depth script editor for editing Lua scripts in your game." so yeah it is Lua

Dope thanks, I found a website that can create a script in any code or even write you a research paper or something like that all you have to do is give it a description like "In Lua Script me something when you touch a part it makes your avatar bigger" and it has a memory of past conversations so you could say like go back and add this to the script or add 3 science facts about skateboarding literally anything and it'll write something for you AI is coming a long way

It's not gonna have ANY brickplanet specific things coded into it so good luck using it for some other things lol

If it actually does work, what website is this and how would I describe an obby save that tells you what stage you're on and saves your progress for next time you join?