What's your "comfort zone" game?

SpiderSolitaire Windows 7 style. I even went ahead and installed it on my Win 10 device.

Open Transport Tycoon Deluxe (OTTD), a free and open source simulation game based on Transport Tycoon Deluxe (1995)

Once in a time was GTA, now I really don't know, don't have much time to play so...probably LoL or TF2

There are a few that I guess could qualify. Generally I don't enjoy replaying games unless there's something that makes the experience notably different the second (and third and forth time), unless it's a very short game. A game like Probotector/Contra I could put on and just blast through. Something like Age of Empires II or Majesty the Fantasy Kingdom Sim also deserves a mention as they have randomly generated skirmish maps that work well for quick sessions.
But I think ultimately the title has to go to Europa Universalis IV, with honorable mentions going to Civ VI and Warhammer Total War II.

The Binding of Isaac Rebirth - I just know I can sink many hours playing it even after I get all the achievements
GTA Vice City - my first GTA. It's just too comfy for me.
Fallout New Vegas - I'm gonna replay it till the end of days.

I´m gonna define this as "feeling at home in a game". For me there were a lot of games like this, changing with time. Maniac Mansion and Zak MacKracken on C64. Monkey Island and Realms of Arkania: Blade of Destiny on Amiga. Zelda on SNES. Outcast, Half-Life, System Shock 2, Morrowind, Ragnarok Online and all GTA-games on PC.

But a main stay in this category has always been the Final Fantasy Series. There is rarely a moment in time when I´m not replaying any of the first 10 mainline-games. 6 and 8 are probaply the ones I feel most at home with.

Yakuza has been on my "gotta play"-list for ages... now that the Steam Deck has opened new opportunities to attack my backlog, I´m probaply going to start playing them soon. Would you recommend starting with Zero, or should they be experienced in the order they were released?

Red dead redemption 2. The game is a masterpiece.
I have to admit though that i also fell in love with yakuza 0 which made me play through all titles in the series, but 0 is the only one i've played more than once. The game is just too good and majima is unforgettable.

Fallout 4 is one that I like to come back to from time to time. I love exploring open world games, and there is a LOT to discover!

The Yakuza series is a favorite of mine as well (what a surprise!). I can confidently say if we ever get the Kazama/Sera/Kashiwagi focused 0 type backstory game I feel should have been made long ago, I'd probably replay it forever.

My top comfort game that I always return to no matter what though, is Tales of Maj'Eyal. I'm closing in on 2k hours now, and I expect to easily get another 2k out of it and then some. I can stop playing it for long periods but will always pick it back up eventually. I love traditional roguelikes, and its my fav of them all. It hits this unique spot of being infinitely deep and engrossing with a never endling list of things to try out, while being very low key, familiar and comfortable to play at the same time.

Probably my fav game of all time, solely from a gameplay perspective.

Wonderboy in Monsterland and Double Dragon

A short hike.
It is a short little game. When I need some time to relax it is always a good choice

PAYDAY 2 and Sword Art Online (for now it's Re: Hollow Fragment)

World War Z

Anti-stress game with no brain usage required.

FTL!
And on mobile I play lots of Solitaire. I have yet to find a good app though that isn't riddled with ads and subscriptions. :(

For me it's Minecraft and ESO.
Minecraft has that quality of completely engulfing you, making you forget everything else in your life.
Elder Scrolls Online has great stories, awesome locations, and is a beautiful power fantasy in my favorite universe.

Warframe. It's a game I play when I don't know what else to play. Crack a couple of relics, sell some primed mods for plat every few weeks, get a prime warframe through relics whenever is being released, and so on

Any Doom game, especially the 1993 one. With the incredible modding community it has it's basically impossible to run out of new content and I know I can always go back to it without getting bored.

Unreal Tournament 99.
Serious Sam Games.
Prince of Persia series.
Batman Arkham Asylum.

Tetris.
But, a good one with responsive controls and no silly extra-easy rules. Arika's series, for example.

Ballistic NG and Distance, because of news awesomes community levels in these games, literally play them monthly for discover the new content.

pinball fx3 and fall guys if I have some spare minutes.
Same with random solitaire-like games.

AS for actual games: pokemon series I guess. Generally I move on to the next game once I've finished a story

FIFA.
Can play it for hours and hours. Bought it in Feb, and have 328h atm. It's easily my GOAT, especially with how great and jam-packed with shit to do FUT has become in recent years. I also love how familiar but also slightly different each new entry's gameplay is, meaning I don't have a large period to adjust.

以前 Terraria 不知不覺時間就消失了
最近開始玩Yakuza 0 整個沉迷 打算系列全部玩

PUBG (4 squad) with my firends.
Its my comfort zone game... IF... there are no cheaters but u meet them basically daily. So this game is comfort zone and also ragequit zone in one pack.