@thomas I love TTRPGs with world-building in them. Some do this on the fly and others do it procedurally in setting up the game.
Games like #Fate, #CortexPrime, and others let you spend resources and make things real, including setting elements.
Games like #TheQuietYear, #Dialect, and #ForTheQueen have you build/change as you go in the rules. #Epyllion asks you to detail the world using a map and I love it.
Games like #Microscope and #I'mSorryDidYouSayStreetMagic are about world-building.