What games have what you’d call really good worldbuilding, and what in particular do you like about them?
https://en.wikipedia.org/wiki/Worldbuilding
Worldbuilding is the process of constructing an imaginary world or setting, sometimes associated with a fictional universe. Developing the world with coherent qualities such as a history, geography, culture and ecology is a key task for many science fiction or fantasy writers. Worldbuilding often involves the creation of geography, a backstory, flora, fauna, inhabitants, technology, and often if writing speculative fiction, different peoples. This may include social customs as well as invented languages (often called conlangs) for the world.
Shadowrun - it had a tremendous effect on my actual worldview (as did other cyberpunk works). The near-future cyberpunk setting offers plenty of opportunity for satire, being rooted in this world makes some geography and history relatable and mixing it with fantasy elements does not only make it more colorful and varied, but also prevents unrealistic stuff from breaking my immersion, because it does not pretend to be realistic.
As a young nerd obsessed with RPGs and William Gibson’s work I was outraged at the idea of putting fantasy into cyberpunk. But then I picked up a damaged copy of the Shadowrun rules from a bargain bin and was blown away by the worldbuilding, they really found a way to make it all fit thematically and logically and I ended up running the game for years.