I just got into watching physics simulation videos on youtube, stuff like marble races, marble battles, Multiply Or Release, and various other simulation content. Absolutely enthralling stuff for someone like me who enjoys simply watching an environment do its thing.

I wanted to get into making my own sims/scenarios and was wondering if you all on tildes had some recommendations. I've been trying algodoo and it seems very nice but I've heard its mostly abandonware and theres some features I find lacking. So I wanted to look into options for my little tinkering. I understand that there may not be a perfect one but I'd love to have some options to try and tinker in, and my research has led me to lots of them that seem at first look to be purely for academic purposes.

To crystallize my desires into a definite paragraph:
I'm looking for physics sim software recommendations to make my own marble races and other simulated 'games'. I don't mind having to learn it from scratch(including scripting language). I dont care if its paid or free. Ease of use is great but Non-essential since it can likely be learned over time. Preferrably not abandonware, or at least feature-rich if development has been completed. and lastly, performance is definitely important since I'll likely be building some grand designs as I settle in.

We have all done it and seen it happen but I don't know its name

Someone has tried and proven that something just doesn't work, it is broken. And so you call the engineer and the first time you try to demonstrate it, it works and then works afterwards every time.

It isn't Murphys Law and it isn't Sods Law but what is it?

I call it Engineer Syndrome but that cant be right