RetroGaming

I still question myself why did not I try it before as it changed my quality of waiting on different places like public transport by large margin:

Try turn based games with Lemuroid (frontend for emulators on android). No gamepad required, always in your pocket, everything works out of the box.

I'm playing psp Valkyria Chronicles and it is great. Such games are perfect format for phone, as anything where reaction and precision is necessary needs gamepad. And you either need to own a retro dedicated handheld and take it with you, or (if you have one) take cumbersome Steamdeck like handheld, which is not feasible for 30 minutes ride.