You should go into Nier: Automata thinking it's a game about a hot chick fighting a bunch of robots. The only spoiler you should know is that the end isn't the end, and you need to play it again.
You should go into Spec Ops: the Line thinking it's a game about a cool special forces team fighting a bunch of terrorists or something. The only spoiler you should know is that it's supposed to feel like a generic third person shooter.
Journey. You can get it on PlayStation, iOS, steam (on sale for $5 atm) and epic. It is 2-3 hours short and not very challenging, but it does look absolutely stunning and has a very beautiful gameplay mechanic that you better find out for yourself.
IMO it is one of the best games of all time and one that really demonstrates what the medium is capable of.
Sauna2000 (it's not out yet, but there are some demos floating around).
Squirrel stapler
Cruelty Squad - depends on the kinda person you are. If you're super open-minded about game presentation then I'd tell you to go into it blind. If not, then I'll happily try to sell you on it. If it helps, the game looks the way that it does because of how fucking confident it is in itself; and that confidence is fully justified. Give it time, even if the first level doesn't hook you, give it time because in my experience it will eventually hook you and reel you in and leave you thinking it's one of the best games of all time.
Undertale
Hypnospace Outlaw
Jet Set Radio, Jet Set Radio Future, Bomb Rush Cyberfunk. Give the first two a try, and if you don't like either one, skip BRC; it's a spiritual successor to JSRF and if you didn't like JSRF then you probably won't like BRC.
Hylics. If you liked that and wanted more, Hylics 2. Hylics 2 actually does something throughout the game that I've only ever seen as a gimmick in other games. It's really cool and it'll probably catch you off-guard every time it does it.
Katamari Damacy. If you liked that, there's also We <3 Katamari.
Myst. The newest version has VR support. If you liked that, the recent Riven remaster also has VR support.
S C O R N (if you like Myst, give it a try. It feels very myst-like)
Hrot (boomer shooter, but if you like boomer shooters then you should give it a go).
If you're at a place in your life where you're trying to still find yourself: Night in the Woods. Especially if you're a furry. This game is really fucking good. It'll make you laugh. It'll make you cry. It'll make you miss home but also be glad you aren't there anymore. It'll make you question your place in life and who you are. Also, you can interact with things multiple times, make sure you don't miss out on dialogue, you'll regret it.
STALKER: Shadow of Chernobyl - This is hard to go into blind because it's buggy as fuck and most people recommend some form of community patch even for your first playthrough. That said, play it on the highest difficulty. It's unironically more fun once you get used to it. If it's too hard though, don't be fooled into thinking that dropping the difficulty will make it easier, the hardest difficulty is special (you can only take a few hits, but the same is true for most enemies), and dropping it down will result in enemy difficulty scaling becoming more traditional (buffing health and damage).
Portal (and Portal 2).
Bugsnax.
If I can throw in a movie too:
Willy's Wonderland. It's a Nicolas Cage movie and that's all I'll tell you. DO NOT LOOK UP THE TRAILER. I wouldn't have watched it if I hadn't seen the trailer, but the trailer also has huge spoilers. I'm not a huge movie person and I had to watch it after seeing the trailer, but again the trailer has spoilers. It is on my top-10 movies list now.
I'm surprised I haven't seen anyone mention one of my favorites:
Spec Ops: The Line.
The risk with going in blind is that it seems like a generic cover-shooter that doesn't do everything quite as well as its competitors but it actually works to its advantage once you get into it.
If you haven't tried it, I highly recommend it, you can usually find it for really cheap.
Surprised I haven’t seen Undertale yet. The online fanbase is hilariously toxic, (seriously, don’t go looking for any extra details about the game after you finish it) but it’s a solid game that should be experienced 100% blind. All I’ll say is that it’s a game that is written to subvert expectations; If you go into it expecting to play it like a traditional RPG, you’ll be in for a big surprise.
warframe used to be. but it's near-impossible now to start & get through even the first major 'holyshit' moment without having it at least partially spoiled before hand.
EDIT: Jade Empire doesn't really fit, so I'll go with Observation instead. I'll still argue you're better off not knowing anything about KOTOR aside from being an RPG in the Star Wars universe.
There isn't a game that exists that isn't better going in knowing very little, if anything at all, about it. I don't even understand reading an entire guide or wiki about a game before you ever even load it up and play.
God of War 2018. I played all the original games but I was still just a casual fan. I heard about the new game coming out but didn't really pay much attention to it. I eventually play it and holy crap I didn't know it was going to be what it was. Before playing it, I had RDR2 as my game of the year but GOW really stole it in the end.
I feel like the obvious answer would be something like Fallout New Vegas, DLCs as well (especially the DLCs) or any visual novel games like Song of Data or the Danganronpa series.
Though for non-obvious answers, gonna say Brok the Investigator. Story driven with changing how you play affecting the ending you get. Non-obvious because I don't see a ton of hype around it, even though there's a cool looking DLC being developed.
Edit:
Forgot to add just about any puzzle game to the list. I watched someone play a puzzle game (Baba Is You) roughly 4-5 years ago and picked it up last spring. Just long enough for me to remember almost none of the solutions. Definitely much more fun that way. Same reason I loved Portal 2 back when I got it on xbox. Didn't have a clue what would happen or what the puzzle solutions were.
I don't think this one is even vaguely possible anymore, but "I Wanna Be The Guy" would be my suggestion for this question. That first encounter with the game is one of the most special moments in all of gaming.
Bokura. This is a bit hard though since the Steam store page kind of spoils it but just get it and think of it as a cool short co-op puzzle platformer.
Factorio and Dyson Sphere Program. At least don't watch people like Nilaus and Dosh Doshington play the game until you've tried to make your own solutions first.
Superbrothers: Sword and Sworcery. This game is fairly old now (like maybe 15 years) and I’ve only played it once and it took like 4 hours of total playtime, but it remains among the most memorable games I’ve witnessed. I HIGHLY recommend it.
The most I will tell you is that it's an adventure game with some minor tower defense elements. And that it is the best game I've ever played, and no game has ever topped it since.
Another opportunity to shout out my 2024 GOTY, Dread Delusion! I have so much love to gush for it. I wouldn’t say it “blows the mind” per se, but it knows what it is and executes it soundly. Give it a shot if you enjoy the sonder-type experience from a well-crafted storyline
I'll also add The Legend of Heroes: Trails in the Sky FC. I know there's a remake coming out next year, but there's a bunch of shady stuff surrounding how they're gonna localize it. (Supposedly, they're gonna use AI to try to do most of it and then have real people brush it up.)
So I'd recommend playing the original instead. It's a 2.5D game with a mostly 360° camera. It uses turn-based combat, but not traditional turn-based combat. And it has a great story.
It's also on sale for only US$9.99 on GOG (which is DRM-free) and Steam.
Way to make me feel old, I don't know any of those games.
Where's my late 90s early 2000s gamers at?
I'm going to nominate:
Fallout (1997) for plot twists and introducing (to me at least) open world role playing.
Fallout 2 (1998) for further plot twists
Max Payne (2001) for stealing bullet time from the matrix and putting it in a game
Mafia (2002) for being a kick ass game that would blow your mind, by making 6 hours of your night disappear, and not lifting the lid on that plot twist before you heard the birds start singing, and realize that you should probably hit the shower and get to school.
Dark Souls and Return of the Obra Dinn have already been mentioned, but I'll also recommend Universal Paperclips. These also happen to be my favorite 3 games.