For me, it´s almost basic, cliché:
Doom I and II - I always find myself coming back to Doom, whether it's on PC (with mods like Brutal Doom or GZDoom) or on consoles. There's just something about these games that brings back great memories of the '90s and all that atmosphere from back then—it feels like there was more creative freedom, more craziness and intensity in movies, games, and music. Aside from that, it's just awesome: some maps, like E1M3 or the early levels of Doom II, I play almost automatically, like they're a portal to a lost paradise of gaming... anyway.
Quake - Even though it's so different from modern games (it feels like something's missing), I always come back to Quake for its aesthetic, atmosphere, and speed; Quake Remastered is a great example of nostalgia done right.
Diablo II - Now with Resurrected, oh my God, I don’t even know what to say. I think I'm gonna play it for the rest of my life—it's almost scary! The game's mechanics and nuances are almost esoteric to me: even now, I still don’t fully understand some of the systems, but I keep learning anyway. Man, sometimes I think you need to take a course just to learn how to play
Bloodborne - I started playing again; I want Bloodborne to be my new
Symphony of the Night (a game I play every year). But I found a trick on YouTube to get overpowered right at the start by grinding a certain Chalice Dungeon, and now, I don’t know... I’m lost and haven’t known where to go for days, so I kinda gave up. I always want to go back, but for now, there are other good new games to play like Jedi Survivor or Deathloop (yeah, I like it a lot!).
Risk of Rain 2 - This game was a discovery for me, a revelation—I didn’t expect to get so hooked on RoR2. It has everything: amazing and well-thought-out gameplay, a ton of mysteries, systems, items, alternate paths, secret stages, and things to discover that even after about 3 years, I still haven’t done much in the game. I don’t understand why this game isn’t talked about more, but to me, it’s on the same level as those big titles. It’s sensational and addictive.
Nioh - I don’t really know why, but I just love this game. The gameplay is perfect; I even set Ninja Gaiden Black aside and have been playing only Nioh since 2018, I think. My character looks a lot like Ryu Hayabusa but has way more features and options. There's something about this game that screams old-school, like the good old days when video games were just video games, and screw everything else. Surprisingly (and no matter how much I play), I still haven’t finished the game and its DLCs. Nioh 2 is cool and all, but I think it’s way over the top for my tastes and sits in a limbo between the outdated (but original) vision of Nioh 1 that made it so special and the modern particle effects, magic, etc., of newer games.
Rise and Shadow of the Tomb Raider - I can’t even explain it, but over time (and after getting over my initial bias against these AAA games), I grew to love them. There's something about them that reminds me of old-school games, but with a modern and smooth feel. Both are awesome, and they’re always installed.
Ninja Gaiden (NES) - I'm getting old and can't get past a certain level anymore, but I still keep trying.
Other mentions:
Symphony of the Night,
Panzer Dragoon Orta (I´m praying for the fruther release of
Panzer Dragoon Zwei - I´ll buy it on release date and I´m sure that I´ll play it forever, help me God, lol),
Super Metroid,
Metroid Prime,
Radiant Silvergun,
R-Type,
Resident Evil 4 (Classic and Remake now),
Dishonored 2,
Outrun 2 Coast to Coast,
Dark Souls II - SotFS,
Demon´s Souls... The list´s long and have the feel that I always play the same games forever.