Mobile gaming is a growing industry as it can be a fun way to pass the time. However, the enjoyment titles made to be played on your phone can be curbed by the need to complete micro-transactions to proceed, or to watch ads to avoid paying for the same. The games-specific variant of the Google Play Store now has settings to help choose new apps without these drawbacks.
https://www.notebookcheck.net/Google-Play-Games-now-has-filters-to-exclude-titles-with-ads-or-in-app-purchases.493452.0.html