I recently just played through the whole Bioshock series for the first time. Top tier games for sure, and still hold up very well.

Surviving Mars. Every time I get back to it, I enjoy it.

Civilization for me... I don't mind the newer versions but I'm old enough that I've played it since Civ I and I do sort of feel like it's lost something as the graphics have improved and animations were introduced. Still, irrespective of the version, every game is a little different and eats hours like nothing else.

Tony Hawk's Pro Skater games 1 through 4.

A bit more than once a decade I play them on emulator and try to 100% them. Great fun. I also try to make sure to visit the locations in the real world if I'm on holiday nearby where they based a level.

It's kind of sad that the Venice Beach area hasn't existed since the 90s.

Edit: I did just realise this thread is about PC games, but I do play them on PC albeit through a PlayStation emulator. I do believe the games are available on PC.

My friends make fun of me for it but...

Football Manager.

I know it's a spreadsheet simiulator but I can't stop.

I'm flabbergasted we're getting no metroidvania love in here so I'll list my two favorites: Hollow Knight and Blasphemous. Both with sequels coming out this year which I'm so excited about!

Cyberpunk 2077 story

Vampire Survivors on the steam deck.

The Binding of Isaac. One of the GOATs for me.

Vampire Survivors I just love that game, after that Tetris.

Since nobody has mentioned it, I'll throw in "X4: Foundations". The X series is janky in places but oh so satisfying if you can get past the jank. Build a military empire to take over the galaxy, or maybe a trading empire. Or maybe you want to become an industrialist and build huge stations to print money. You can be a pirate or a salvager or any combination of the above. And there are tons of interesting mods if you get sick of the vanilla game.

Love this game!

I am playing Skyrim. For the second time, now in Special Edition.

Good ol' Skyrim. The possibilities to break the game are nigh endless.

Neverwinter Nights, I enjoy playing some of the campaigns and modules every so often, trying out different builds.

Warcraft 3, just for the original campaigns and also the stupid amount of custom campaigns made by the community.

Workers and resources. It's like cities skylines on steroids.

Prey. I enjoyed it more than Dishonored, it holds a real special place in my heart.

Rollercoaster Tycoon / OpenRCT2

Transport Tycoon Deluxe / OpenTTD

While they do now have multiplayer modes thanks to their corresponding open source projects, I still think the spirit of these games is firmly in the single player pc game category. Best of all they're both free and available on any OS!

Fallout New Vegas

DemonDarkBloodEldenSoulsBorneRing.

Edit: Of those that are on PC, anyway. I got tired of waiting for even an announcement that a BB or Demon Souls port was on its way and got a PS5 just for those two things back in January.

Dying Light, absolutely fantastic pakour zombie smasher with one of the best cities in gaming. Bought it originally (on a disc) many years ago and played it so much the disc died and I was inconsolable until Epic gave away the ultimate edition and I was finally able to play The Following DLC.

Now I go and look at Dying Light 2 on Steam and wish my stupid country wasn't so damn expensive, even on sale at 50% off it still costs almost as much as a brand new AAA game in the states. Regional pricing my ass, we always get stung so hard for tech down here.

Cassette Beasts, it's like Pokémon far more different than other pokeclones, and far higher quality imo. The beast designs are great, and there's a cool fuse mechanic you can use to fuse any two Beasts, with unique art (over 16,000 possible fusions). Also the shiny-equivalent is better done and actually useful.

BPM: Bullets Per Minite

Doom meets dungeon crawler meets Crypt of the Necrodancer.

Transport Fever 2. It's like Transport Tycoon (/Deluxe) from the 90s/OpenTTD but way more beautiful and 3D.

doom

Minecraft Rimworld Cities Skylines Satisfactory

The Binding of Isaac. It is too addictive

Fallout 4 ☢️

Ultima and Wing Commander, I know I'm showing my age but I guess it's the nostalgia. I still go back and play through them.

Modded Minecraft. So many good mod packs available.

Definitely Civilization in general. There’s a lot of other games I like that are completely different, but year after year I come back to the Civilization series. And even though they peaked at Civ5, it’s still one of the few games I’ll preorder as soon as the next one is available.

Minecraft

Stellaris and Factorio

Medal Of Honor 2010 & Call Of Duty 2

Factorio, Rimworld, Terraria. In no particular order, they're all perfect at what they do.