Hearts Unleashed
The card game Hearts, played by the standard rules or by your own.
You play against three computer opponents. There are four levels to choose from, and a fifth to be earned. You can play by the standard rules or switch to Unleashed, which is worth more and plays harder.
Playing on your own collects nothing at all, needs no internet connection, and shows no adverts. There are no accounts and no purchases anywhere in the app.
There is also an optional daily competition. Everyone gets the same deal, you get one attempt at it, and the name you choose appears beside your score on that day's table. That part does need a connection, and what it collects is four things, listed in full in the privacy policy.
Playing on your own is free and has no adverts, and will stay that way. It runs entirely on your phone, so it costs nothing to keep running, and the engine it is built on is open source. The daily competition is different: it runs on a server, and a server costs money every day it is up. A few adverts in the daily are how that is paid for: one as you enter a competition and up to four while you play it, and nowhere else in the game.