Simple digital games like puzzles, quizzes, and card games stay popular because...

https://daltonssuperjournal.wordcanopy.com/posts/how-do-you-balance-simple-rules-with-enough-variations-in-mobile-gaming

Simple digital games like puzzles, quizzes, and card games stay popular because they're easy to pick up anytime. You don’t need a big block of time to enjoy them, making them perfect for smartphone sessions