Elden ring with seamless coop and 3 of my friends. It would be insane discovering the whole game together at the same time.

mother 3

Another I would add is the first Infamous, final boss fight. The reveal was great for an already great game.

Erase Space Quest 4 5 or 6 from my memory, let me play them fresh

I wish I could go back and play Her Story again. My wife and I stayed up all night 100%-ing that game years ago, and it was one of the best gaming experiences I've had, sharing our theories as the story unfolded. Unfortunately though, once you know the story, there's no reason to replay it.

We tried the sequel, but imo it wasn't nearly as good - both mechanically and story-wise.

Bit of a different one, but absolutely The Witness.
I adored learning all the puzzle mechanics, and exploring the island.
And for those in the know, the biggest discovery of all would be incredible to experience again for the first time (I at least managed to get some second-hand wonder watching my girlfriend piece it together).

It's a recent one, but the first time I entered Giant's Deep in Outer Wilds. I have a pretty big fear/anxiety of the ocean and meteorological objects in large sizes (strange one but I feel sick and get vertigo looking up at large clouds). I also find gas giants to be eerie in general.

The first time entering the atmosphere I was sweating so hard, I had to take a shower. No horror game where the main intention is to scare me has ever given me that feeling before. I've only felt that kind of stress when I played RE Nemesis on the PS1 as a young child. The Jeff chapter in Half Life Alyx also came pretty close to that feeling.

I might be a masochist, because I want to experience that again.

NieR Replicant (2021). One of my favourite games, I really liked the story and the characters

Planescape Torment, Mark of the Ninja, Gunpoint, and The Swapper. All great for different reasons.

I would kill to be able to experience Nier Automata Ending E for the first time again.

Yakuza series as the whole. I would do anything to experience it fresh once again.

The End from MGS 3 and Glock Saint Isshin from Sekiro

Oh and maybe half life 2

Oh man, so many games. All Metroid (except other M), the first Diablo (especially the Butcher fight), FF6, especially after the last boss battle, will always feel bad about shadow 😔

Destiny 1 before all the DLC and taking away to stuff that made sense to get into goofy shit. Though I'd take being able to play it all again, too. As is I can't make myself play destiny at all any more.

But some of those early strikes solo for the first time were crazy immersive.