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.

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

Solitaire

It's 240 comments and no reference to Touhou?????

I play Taisei Project (FOSS bullet-hell shooter) and 3D Pinball: Space Cadet because it was #1 game in the list on Discover app.

Risk of rain 2, shit's addictive when you start getting decent at it

Subnautica, I just keep going back to it it's like my comfort game.

The Sims 2. I’ve played a fair amount of all four Sims games including their mobile editions, and Sims 2 remains my favorite after a near (yeeesh) 20 years.

The modding community is still relatively robust, especially for a game that’s so old and out of the four, I feel like I can enjoy even the basic gameplay as a storyteller in Sims 2 more than in 3 or 4. In Sims 3, the focus was less on playing multiple families, so it had to be modded right out of the gate to get back to its foundation and I never liked the way the sims looked. Sims 4 “feels” a lot more like Sims 2, which a lot of people hated, but its expansion and content packs are a complete joke. It costs like $2K to have everything, and they’re still releasing packs. I know it’s just the state of gaming these days, but it just sucks the fun out of a lot of the game.

Half the fun these days, though, is just getting the game up and running on modern PCs. I installed a new hard drive a few months ago and it took the better part of a weekend to get the game fully installed and running. I do have Ultimate Collection, but the less time I have to spend in that stupid EA app, the better.

I’m gonna add Space Haven to the list. Still early access but I can’t stop. Been playing it on and off for the last year, 200 hours!

Kenshi! Getting your ass beat by slavers again and again has never been so fun!

Quake (1996). Still playing it more than 25 years later :)

Fallout New Vegas

Total War Warhammer games. I keep starting new campaigns to play all the races and subfactions.

Oxygen not included

Hitman: World of Assassination

Tetris.

Crusader Kings, Europe universalis and imperator Rome. I know this is three games but it's the same general idea, as a history fan, this game scratches a very specific itch for me

There's also bannerlord/warband, amazing experience, sorta like ck3 on a micro level

Heroes of might and magic 3. What a gem! With the HD mod and Horn of the Abyss fanmade expansion (with a new town YARRR!), it's never dull.

I can't wait for the next update of HotA with a second town.

Subnautica and Enscryption :)

Grand Theft Auto IV. I've always felt it has the most emersive storyline and setting out of them all. Once you get past the janky driving controls it was a hell of a lot of fun.

Most of them that I play since I'm not big on multiplayer. Lots of RPGs (Mass Effect Legendary), colony sims (Rimworld), city builders (Banished), and grand strategy games (Stellaris)

I'll still install Duke Nukem 3D every couple of years to replay or to play the custom maps that were so easy to make.

OpenTTD is also great to mindlessly play while listening to podcasts.

Metal Gear Rising Revengeance

Factorio and rimworld

Enter the gungeon. Played it so many hours across different platforms.

Rimworld and factorio cause time to disappear

Minecraft I keep coming back to year after year.

FTL is pretty fun too

I love to start a new round of Civ 6 or a create a new city in City Skylines, because i learned so much from my previous mistakes and this time i will create a perfect civ/city... only to make super stupid mistakes nonetheless and fail miserably. It's still great fun though.