Why do you love playing video games?  

I experienced playing some computer games, but none of the games you've mentioned. At times, it would be good to play as a form of relaxation and stress management. However, if we spend a lot of hours or days and neglect other important things, then it becomes an addiction that needs to be stopped. It's fun playing computer or video games but not all video games are good for the mind and body.

I think it is more or less the feel of getting challenged to do something or to have some sort of goal that you feel that needs to be accomplished. Kind of like many things in life, we set goals and overcome challenges and sometimes it's just for the sake of completing them. Same thing in games, be it saving a princess so many times or grinding to level 99. That and the other things that fill in the gap like social interaction, reaction and prediction challenges and so forth.