Steam

Factorio. I don't even need a second pick

The store tab and the library tab

factorio and rimworld. I can't believe that combo isn't here yet.

Ah, but would you keep Workshop access?

If so, Garry's Mod is almost cheating. There's a bit of everything in it.

So that and Warframe. I picked up WF ten years ago and it's still in my top ten recently played games. Though I have a love/hate relationship with the Metagame it turned into, it still remains.

RetroArch ;)

Fallout 4 and Civ VI

Easy

I would say noita and beatsaber.

Slay The Spire for replay value and Rocket League for "pvp" itch.

Factorio.

So I'm going for longevity. These two definitely wouldn't be my first choices for top games.

Elder Scrolls Online and Minecraft. There is enough story, social, and creativity that I would hope it works out.

Once Baldurs Gate 3 gets solid modding, and assuming modding is allowed, that takes a spot.

The Long Dark and Valheim

Slay the Spire and Noita

For longevity?

Satisfactory and Elden Ring.

Honestly, something like Call of Duty or fortnite might be nice too. I haven't played in years but the skill ceiling is very high so it could at least keep me occupied for a very long time.

Satisfactory & Mass Effect

Deep Rock Galactic and Pinball FX3. I'm tempted to put Baldurs Gate 3, but once you've done a number of runs, I feel like you'll be done with it.

Terraria and Starbound bc mods

I have a very specific taste

Dwarf Fortress and Dota 2

Skyrim and Half-Life 2

Rimworld and M&B Bannerlords

I really wanted to fit Crusader Kings 3 in there, but I think ultimately these two cover all the bases, and have an amazing modding community to keep it fresh and interesting.

Dead Cells and Beat Saber. I don't know that I'll ever tire of dead cells, and beat saber my husband and I love to play together, trading off after three songs like we used with DDR when we were kids

Binding of Isaac (flash) Binding of Isaac Rebirth

Literally thousands of hours of entertainment, pretty much

Factorio and project zomboid

Dwarf Fortress and No Man's Sky. I wanted to say Satisfactory instead, but felt it might be too close to Dwarf Fortress in nature and that would make it hard to want to play either game if I was burned out from one of them.

Slay the Spire would be the first slot where a lot of others could fill the second.

Warframe is a good one. After 4000 hours I got burnt out of some of the things it does poorly and haven't played in a year, but overall it's fun with crazy new content on a regular basis for free.

Terraria has far more depth than I ever expected, and way more than that added since I last played. This game can sustain a player for ages.

I would say Satisfactory but I did actually get tired of it for a while. Itching to go back with the 1.0 release though. I love it but the two above have better longevity.

Baldur's Gate 3, and um... Warthunder. Maybe Elite Dangerous instead of Warthunder. But why can't I play the $650 worth of other games that I bought and barely played?

TF2 and TF|2

Funny how there's a solid lack of quadruple "A" games here in the comments.

Does it have to be Steam? Or any two games?

the talos principle 1 and automobilista 2

Terraria and I can't decide between Skyrim, Fallout New Vegas or BG3.

Probably age of empires and MCC.

Torchlight2 and totalAnnihilation

No man’s sky and palworld

Civ 6 and I'll sell my other slot to the highest bidder.

Nioh 2 and Satisfactory

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

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.