voik

I have not yet played Return of the Obra Dinn, but it is always high up on the list when I look for games like Outer Wilds. I'm a huge fan of Outer Wilds, so maybe the recommendation can work in reverse

From what I have heard, the deduction is not as intense as in Obra Dinn, but there is very little hand holding, and the whole game has been brilliantly designed so that it is driven entirely by your natural human curiosity. Once you get through the initial "tutorial" section (probably the roughest part of the game, push through!) the whole game is wide open. See something weird orbiting a distant planet? You can go straight there and start poking around. If you follow the leads that turn up there, you will eventually even figure out what it is, and why it is there. Do that enough and you'll eventually figure out the strange mystery of your home solar system.

Can't recommend it highly enough, but you only get to play it without knowing the secrets once, so go in as blind as you can. It took me 20-30 hours to "solve" the main game, maybe another 20 for the DLC, which is also well worth it

Some really interesting ideas here, downloaded!

Man, we ended up setting up a wiki for all the ones from my last campaign... it's down at the moment, but here are a few I have saved on my phone:

"My companions and I are professional adventurers"

"Some of us more professional than others..."

"For no sexy reason, what does the pope look like?"

"Also, I'm not doing terrible! But I definitely just got stabbed."

Bard: "No, this is wholesome [Bard] moment! Anyway, how much money do you have?"

Sorcerer: "[Ranger], we are about to do some wacky-ass magic"

Ranger: "In that case, I would like to watch it from over there."

Sorcerer: "I will not be doing it. I will be joining you."

GM: "Divine and wild magic start pouring into and it's like... Have you ever licked a battery?"

GM: "Divine, chaos, and dragon magic flows through you—"

Bard: "And bardic from the inspiration!"

Ranger: "Oh I can add some ranger nature!"

Sorcerer: "And I have one that can help! I cast minor illusion to make a "do not disturb" sign."

"If I take one more step, it'll be the furthest I've ever been from home..."

"You didn't even have to step."

"If I take one more interdimensional vortex..."

"Your left or my left? You're an orb."

"I am."

"Float like a flowerpot, sting like a school bus."

That is exactly what I ended up doing! It was a blast, definitely would also recommend

Outer Wilds

If you're a naturally curious person, the odds are you will probably enjoy Outer Wilds. No other game I've played has ever had quite the same blend of mystery, conquering the unknown, and semi-realistic space exploration.

Could someone make another game like it? Not impossible, I suppose, but I think you would be hard pressed.

Should you keep playing the original? You really can't, one time through is all you get. Once you have discovered all the secrets and uncovered the mysteries, that is your journey through it. Still fun to visit every once in a while, though

The Chaos

Ahhh, loads of them!

D&D adjacent stuff like Pathfinder 2e.

PBTA and kin like Dungeon World, Monster of the Week, Ironsworn. Blades in the Dark.

Delta Green.

I have a whole folder of freeform, GMless stuff like Microscope, Kingdom, Follow, Archipelago, Dawn of Worlds, Dialect, Intrepid, The Quiet Year.

Gonzo one shot stuff like Paranoia, The Sorcerer Supreme, Ten Candles, peace was never an option (think untitled goose game: the rpg).

I recently had a test run or two of Fate Condensed and got completely hooked.

Most of those I'd be content to run or play, but the game I really want to GM myself is a campaign I've been dreaming up for about year now that I call the "sedition sandbox". The scope is focussed to a single city, the capital of a hostile foreign empire. The PCs are an elite team of saboteurs and infiltrators, sent by a nation desperate to turn the tides of a losing war. Their only objective is to bring down the empire from within. Intrigue, plots, rebellions, sabotage, faction politics, assassinations, propaganda, blackmail, anything the players can think of to achieve that goal is fair game. How far will they go to stop the greater evil?

I think it would be a blast (naturally, I guess), and one or two players in my local network have expressed a little interest, but I've yet to rally the kind of commitment I think I'd need to really get off the ground. And the inexorable march of time makes it less likely with every passing day, as my friends either move away or are subjected to all life's little tyrannies of responsibility ¯\_(ツ)_/¯

Seconded! OP, in a similar vein as the world building games you already mentioned, you might find Intrepid interesting. I could see it being used to do world building + history of some of the major players and nations therein.

I could also imagine the relationship map it uses being hacked a bit to allow for some Disco Elysium style personality skills / thought cabinet shenanigans if you were interested in leaning into that in particular.