why are video games so additive?

Reasarchers belive kids and adults stay glued to video games because the fun of playing actually is rooted in fulfilling their basic psychological needs.we think there's deeper theory than the fun of playing says richard ryan a motivational psychologist at the university and lead investigating in the four new studies about gaming. they found that games can provide opportuities for achievement,freedom, and even a connection to other player truped a shallow sense of fun which doesnot keep players as interested.