Most immersive games?

I realize the term "immersive" is something of a buzz-word for video game marketing, though in my mind it's very much a real thing and it adds a lot to the experience for me. Lately I've been diving into Subnautica (pun intended), and before I know it I'll have sunk (also intended) 3+ hours into a session. Some others that fit the bill for me include Outer Wilds, Control, Fallout 3/NV/4, and many more I just can't think of at the moment.

Beyond just the games, do you have any method of making your experience more immersive? Even if it's just headphones and a dark room, I'm curious to hear what everyone thinks!