Simple games and short videos grab attention because they’re easy to understand...

https://www.tumblr.com/valiantpandemoniumwraith/821710110706532352/why-do-i-get-invested-in-outcomes-i-cannot

Simple games and short videos grab attention because they’re easy to understand at a glance and visually engaging from the start. Think of a Plinko-style drop where you can't help but watch where the ball will land