Underground subway station
The subway challenge. I started doing this tutorial almost two years ago, but then I shelved it because running Blender in a CPU-only mode caused visible FPS rate drop on such a complex scene. I basically could not proceed.
The Udemy tutorial was called “The Subway challenge” and aimed to boost a variety of Blender skills, but I would not recommend it now, as, first of all, it is pretty dated (Blender 2.8 based) (last updated in 2024, so probably it's now better), and, secondly, listening to the tutor was a real challenge sometimes.
So I made it to a certain point, added a few custom things (for instance, a LED screen I took a picture of in the Berlin's subway, a ticket machine and models of some rubbish from Blenderkit) and decided to release it. Check.