Computer Gaming Update
Well, I have now spent scores of hours playing Factorio and have almost completely ignored, so far, the excellent new Civ 6. I was about done with Factorio when I discovered Bob's Mods, a set of game mods that about triple the number of resources and chemical intermediaries and make the game one or two orders of magnitude even more complex.
This is going to have incredibly niche appeal, so be forewarned. If you spent most of your time in SimCity or City: Skylines trying to optimize road flow rather than making a pretty city, or if you like Space Engineers, this may be your game.