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That would be traditional CATHOLIC meditation, not sanskrit or whatever.... right?

Technically speaking, these practices come from the original Pali Canon Buddhism and some other traditions, but there is a lot of dispute over whether or not that is a religion or philosophy. I've talked with a conservative SSPX priest about this and he said it was okay. He said that Buddhism has a lot of decent things to say, just in terms of natural psychology and philosophy, but it gets everything totally wrong with ultimately being agnostic and indifferent about the truth. How I see it, is that the Buddha didn't invent the practice of mindfulness meditation. It was an underlying truth of reality all along. This is just the best system I've found to annihilate distraction and focus on what you are doing. This is especially helpful when you have to do hard things that require a lot of focus, and when you don't have to be directly thinking about God constantly. It's a good way to avoid exhaustion and anxiety as well. This is why even Catholics will seek psychological help not too uncommonly. Even Stephen Heiner liked a book called "zen habits". The paper does explore some of Buddhism in order to better understand what is going on there, and as a matter of fact, it is actually a book review. I have a Catholic "internet friend" who struggled a lot with anxiety and he said the idea about thoughts not independently existing from other thoughts has been a tremendous help. I can tell traditional Catholics aren't all that mentally disciplined, and it's unlikely that just praying the Rosary everyday is going to make you into a man with iron focus and who can detach himself from all clinging emotions. I've seen too many trads who are totally okay with interracial couples (heavily promoted by the elite) and who just don't really care about their physical health. Those are just two examples of how we have become deluded, especially by society's predominant fault, which is mind-wandering. We will always fall into sin if we let our minds continually think about anything that isn't obviously scandalous, because our monkey mind is a fabricator of subtle lies. It's also about finding a good epistemology, and finding out just how incredibly easy it is to get deceived, because we assume whatever we are seeing has inherent existence in the way that it seems to, when in reality there is much more depth to its phenomenal arising.

Nevertheless, I do pray the fifteen-decade Rosary everyday (unless there is a very serious reason not to), and I do fast and abstain on traditional days, and I'm not okay with the neo-SSPX. I'm very, very anti-liberal myself. That's why I don't want to think constantly. I can assure you that everything I wrote (as well as the book being referenced) is essentially free from all superstition and idolatry

You don’t have to quit video games.  They aren’t a bad hobby.  Just limit them and try new hobbies, such as: hiking, woodworking, camping, mountain biking, or even training for small running events in your city.  What about cooking, metalworking, writing a book, drawing etc.  It all depends on what you are interested in.  If you like computers, like Matthew, then learn to build one, learn coding or learn to repair them.  But I wouldn’t say you have to stop playing games, just branch out into other things.  Diversify. 

Things may not be evil of themselves, but they do have consequences. Because of that, I'd say video games are generally bad. They are too rich (think modern candy rich) of an entertainment, so they are naturally addicting, not that everyone will become addicted, and naturally lead to laziness, because they make it seem like such great things can be accomplished with such little time and effort. Such rich entertainment will spoil our appetite for things that are a better use of our time. Rich entertainment, because they resemble a fantasy world or real life dream that, being created by someone else, comes with practically no effort or imagination on the user’s part. It’s not just passive like TV, there’s some engagement in problem solving and building skill, but it amounts to very little, since the works done are in a false reality. As children of God, and made in the image and likeness of God, we should engage in real and godly works, making art and growing in virtue in the real world, rather than a fake one. You might say there’s a demonic inversion to engaging in the fantasy world of TV and video games that robs God of the fruits of His creatures’ creative power. It's like living and working in the devil's world, since he can't create anything real, but can manipulate to deceive. I don’t think there is entirely no place for them, but we don’t need them, and their beneficial use is minimal, and must be with much moderation. As a tool, maybe. As recreation, highly discouraged.