Two come to mind. The first was when I was about 6 years old and walked in on my older brother playing Sim City 2000 on our family computer. It was the first time I had seen a video game of any kind. Before that, I thought computers were just boring machines for doing adult work. Seeing him playing a game on there changed my life, I've been a PC gamer ever since.

The second was when I beat Super Mario Bros on GameBoy. It was the first game I've ever beat fully and it was an incredible feeling. Took me almost a year to do, incredible grind at that age.

Stray. Honestly the entire game.

I am a cat dad to 3 cats and I rescue anywhere from 1 - 5 alley cats every year. I take them in, clean them up, get them spay/neuter and their vaccines and find them homes.

That game captures cats so incredibly well. The entire game was a pleasure, but there are a few moments that stick out to me.

Spoilers

At the beginning when he falls and is separated from his friends.

The way that the guardians react to him.

The desperation of being so incredibly close to freeing them and so nearly being thwarted.

But most of all, when his friend dies and when the ceiling opens.

And last but not least, at the very end he sniffs the air and smells his friends.

So some god amongst men on YouTube did the painstaking work of figuring out where stray fell, and where he exited and found that stray exited only a 20 second walk from where his home was, and towards his home is the direction he took at the end (but the game doesn't tell you this).

That game was the most wonderful and amazing experience I have had in a game since I can remember. I cannot recommend it enough.

I know it's not the answer you're looking for, but I've played an awful lot of games, and none of them have ever done this for me. I can't imagine I'm in a tiny minority in that regard.

The Missing: J.J. Macfield and the Island of Memories.

I can't say why it was a profound experience for me because that would spoil the whole game, but after I finished it I just sat down and stared at the ceiling for an hour or so.

The first season of telltale the walking dead. The ending with Lee and Clementine had my newly Dad self crying.

I was playing "The friends of Ringo Ishikawa" and realized that, instead of simulating Ringo getting his life together, I should be getting my own life together. Not a bad game, to be clear.

I feel like I had an epiphany at the end of Omori, but I am too lazy to write it out. Play Omori.

The Stanley Parable was a great exploration of the nature of free will. It was a game that made me think about the nature of the relationship between me and the creator of the game.

An RPG on Steam. A story beside. Never thought I'd play a RPGMaker game. One of the best storytelling I've seen. An incredible and truly magnificent voice acting and a gripping story. I was left without words at the end.

Played a cracked version of the game. As soon as I finished it, I bought it for me knowing I wouldn't be doing a second playthrough and bought 3 other copies for friends.

I think I'll remember it until my last day. Also, a single playthrough of this short game made me understand why voice acting is important, and what it can create when it's truly good.

CoD: Black Ops 1 is a freaking masterpiece. It made me expect more from videogames and appreciate the little details. Then Ghost Recon: Wildlands and Fallout 4 were the first games that made me realize that an open world with such content was possible and the RPGs world. I know they are not massive, but I had only played in an Xbox and I had to be picky because I'm no rich. But yeah, I only have good anecdotes with those games and how impressive it was for me, mostly Fallout 4 because of secondary missions that had an impact on me, and then the other Fallouts which I'm playing in order right now and every one has its own impact, I love the franchise.

Extra: I love R6 and it was one of my favorites of all time, then I was introduced to the enshittifcation concept without knowing it lol. I kept playing Battlefield 4 rather than returning to R6.