Simple digital games like crosswords and card games keep players coming back...

https://spencersmasterinsights.urbanvellum.com/posts/why-do-i-quit-a-game-when-it-adds-too-many-new-features

Simple digital games like crosswords and card games keep players coming back because they're easy to pick up and fit into busy days. You don’t need a manual—just tap and play. The rules are straightforward, but there’s enough challenge to stay interesting