Okay so… as far as mobile games go, Monument Valley and Monument Valley II are S tier. They are single player and have a good story. And the best part, no ads.
The only drawback is it’s about $5 for each game, but if you are willing to spend the money, they are very cool
You should get Alto's Odyssey and agent A. Both are s tier
Also if you have an Apple device, get Apple arcade because for $8 a month you get a ton of games with no ads. Like, over 300 games. And most of them are really good
Geometry Dash is really good, it’s 2 dollars but you get basically infinite levels because of the community and there’s no ads or micro transactions either