Mobile games are designed to be addictive using state of the art behavioral psychology to keep you hooked. Games are immersive experiences that provide you with a high amount of dopamine, and overexposure to this level of stimulation can cause structural changes to your brain.
You begin to live in a world where you expect instant gratification. Games are so immersive that it’s easy to play for hours and hours without even noticing that a minute has gone by. They allow you to escape and see measurable progress. They are social and create an environment where you feel safe and in control.

Sources of info : https://gamequitters.com/mobile-game-addiction/