The website nobsgames.stavros.io helps surface these, and let’s you filter out based on different things.
One that I like in particular is Gauguin. It’s a Sudoku-like with different math-y rules.
Anuto TD is a tower defense game that is also really good, but not so low stress.
Lichess, if you’re into Chess. It’s a great, no compromise, high quality app. Stressful if you get too worked up about competitive, but puzzles are at least relaxing.
I haven’t kept the closest eye on this - rumor is they’re planning to port more of their games to competing platforms, maybe allow 3rd party Xbox hardware, and phase out most physical Xbox games, right? Or am I way off the mark?