Look up the end. Watch a speed run that kills all bosses and doesn't use glitches.
In this speed run you will see all levels and understand the whole story. Notice that you will run through levels that look the same over and over again. They are all made up of the same building blocks. With the same type of enemies everywhere. You are only fetching things that were arbitrarily distributed in the world by the developers. Most items that you pick up have literally no value at all. Not for your specific character, but also for no other play style. All enemies are following a very similar style, and the play style against them is also always the same. You are fighting the same enemy over and over again, run through the same level over and over again, and pick up items that you will never use.
What good does it do you to do the same run through the same game again, if you already saw this run performed by a speed runner?
What good does it do you to "beat" a game? This terminology is plain wrong, because you don't "beat" games. You just finish it. You don't "beat" a movie either. And nobody congratulates you on "beating" Game of Thrones. Nobody congratulates you on "beating" another game either, of course. Because it is no achievement.
Its like building a lego set by following the instructions. There is no individual contribution to it. Your experience by playing the game is very much like the experience of every other person playing this game. You are on rails. Even in games with an "open map", there are just items and predefined game events scattered around the world. And there are always NPCs that tell you: "now go here" and: "now go there". And you are following this path.
They keep you busy, but not productive. They just take your time away. Power is work per time. But if the thing that you do is not work, because you don't progress towards something meaningful, there is not power. It's like pushing against a wall. It might be tiring, but since you can't move the wall, you didn't perform any work.
And just like that, playing video games is not something purposeful. It is just busywork. You are doing something without meaning. Sure you might have fun (even though this fun will be reduced ever time that you notice that you didn't do anything meaningful with your time), but everything can be fun. You release dopamine when progressing towards a meaningful goal. The game mimics the progression towards a meaningful goal. It will tell a story, e.g. with some monster to be slain, or some people that need your help. Or - if its a sandbox game - you will make up your own goals inside the game. And then you will progress toward this meaningless, empty goal. After achieving it, you will feel empty, because the goal itself was empty and shallow. So you will start progressing towards the next goal.
It is this progression that releases the dopamine. If you sometimes feel the urge to keep playing. Or to start playing. This urge is dopamine. It is not released on success. It is released on progress, and on anticipated progress. It is a neurotransmitter that makes you feel motivated. It is not necessarily your friend. Because this pressing urge, drawing you towards these tools of instant gratification, it is dopamine as well.
Without dopamine, you wouldn't feel like doing anything at all. You would derive no pleasure of doing things.
But with dopamine in the wrong place, you feel like doing many things that aren't actually productive.
You will get the dopamine anyways. If you play video games, or if you do something productive. You brain will release the same amount of dopamine each day, averaged over a few days. So if you spend all your dopamine consumption on video games and porn, or if you focus it on productive work, doesn't reduce the dopamine that you will get. But it will reduce the feeling of guilt and emptiness, that you would get from noticing that all your efforts were meaningless, and your results worthless.
Virtually all video games revolve around violence, war, fighting. These are the ways not to live a successful life. As foot soldier, your pay is little in comparison to a high skilled trade. And you are putting your life and health on risk. On the other hand, as leader, war is also a downgrade. Your country is destroyed and loses tons of money and people (which are essentially also a resource). You might be able to push the borders a bit further out, but what good does that do you personally? Where is the benefit?
Other games focus on grinding. Mindlessly doing the same thing over and over again. If you are into that, you could put it better to use by grinding in a job, or by cleaning your apartment.
Progressing in video games is no achievement. They are meant to be progressed.
"Difficult" single player games like Dark Souls are not really difficult. You can run through each level as often as you like, and fight each boss as often as you like, until at some point he dies. If you die 1000 times, and the boss dies once, you still advance to the next level and feel like you achieved something. But you didn't.
Multiplayer games actively influence the composition of your party and the opposing party, in order to determine when you should win or lose.