Mobile games usually get a bad rep as they’re usually asset flips and/or MTX-ridden and/or ad-filled, etc., and I’m sure this is actually the case for most games on the app/play store. But are there any ones that are actually good, maybe just something to pass the time with?
Fancade! It’s a huge collection of user made arcade games. Most are trash but there are some hidden gems. It works offline, but it occasionally shows ads when playing online. You can remove these ads with money or by using an ad blocker.
Some other mobile games I recommend are Mindustry, PvZ and Luanti.