Steam

Skyrim and outcast (the old version by appeal studios)

path of exile

Battletoads and Frog wars.

Vermintide 2 and Tekken 8.

Both games have high skill ceilings, so I could probably spend years (and have) playing both and still finding ways to improve or optimize gameplay.

Team Fortress 2 with either Deathmatch Classic or Ricochet....

Skyrim and Witcher 3. Shoutouts to Baldurs Gate and Witcher 2, but the latter is far too short for me to want it on my "you can only play this" list, it's quirky but there's something special as hell about it for me. I've played it through about 15 times.

Stardew Valley (maybe not that if I can just use the Android version), Hyperbolica, Portal 2?

Factorio now, and I'll save my second one for Factorio Space Age when it releases.

Slay the Spire. I probably don't need a second.

Bloodstained: Ritual of the Night

Octopath Traveler 2

DayZ and minesweeper. DayZ has probably the best replayability over any other game I've played. On top of that it's also the game that gives me adrenaline rush like no other game has. DayZ is highly underrated and I highly recommend it in 2024 as it just keeps on giving.

Beam.NG would be one just because it covers nearly every driving discipline and the other would probably be Cyberpunk. It’s not even that Cyberpunk is my favorite, but it has so much content in it at this point that it would keep me busy for years.

Path of Exile and Rocket League

Path of Exile 1 and 2. Not much would change

Assetto Corsa (assuming mods are included) and Factorio (again, with mods, but to a lesser degree).

Planescape torment and HoMM III (yes I will take the bundle, thank you)

So, we're just talking Steam - that means I can keep playing Fortnite either way. And my GOG library I suppose :>

From Steam I'd pick:

• Beat Saber, it's my sport
• Stellaris, so I can keep playing it with my SO

Factorio and Baldurs Gate 3...

Feels bad leaving off other amazing games though

If we get access too all future updates, Dwarf Fortress is my clear #1 choice.
If we also assume that the game will forever have an active enough userbase that lack of players won't be a detriment: Infinity Wars as my #2.

If we assume no updates, no mods and no guarantee of users: Tales of Maj'Eyal and probably some 4x or grand strategy game, it's a tossup between Civ, Gal Civ, and Endless Legend, maybe even one of the Total Wars.

Dota 2 and Factorio (with mods enabled)

Dirt Rally 2.0 (with my sim rig and VR headset).

I don't need a 2nd game.

If I am honest and base it on my actual play patterns it has to be The Binding of Isaac and Slay the Spire. Or maybe Ascension (digital version of the physical deckbuilder) especially if there is ever more content for it.

Dwarf Fortress and Factorio.

Stellaris and Rimworld. Replace Rimworld with Minecraft if including non-Steam games.

Minecraft and retroarch.

Just woke up. I thought this was a picture of valheim with a deathsquito on the background. Which is interesting because I was probably going to have to pick Valheim and Sims 4. If I can only playb2 games forever I need sometimes that doesn't necessarily have a main quest then it's done and both of those fit that.

Oxygen Not Included and Baldur's Gate 3 for the 1 month out of the year I take a break from ONI.

Would choose those 2 because it would let me kinda bypass that limit
Source Sdk 2013 Multiplayer
S&box

Civilization 5 and Space Engineers

Rain World!!!!!
Second place is hard to do though! Oxygen Not Included, I guess?