My list would have to be:


-Diablo 2
-Sacrifice (bet you didn't see that one coming)
-Dune 1
-Gothic
-Impossible Creatures
-Majesty
-Postal 2
-Morrowind
-Sword of the Samurai(1989)
-Duke Nukem 1
-Monkey Island 2


That's all i think. Also, a special mention for Blitzkrieg, which we recently got here on GOG.

Agree with those who listed SS2 and STALKER, but Morrowind may be my all-time winner. I was content to let my real life disappear completely, and living in the box felt so rich that I completely ignored the main quest for months without any sense of grinding or aimlessness. What an amazing game that was.

I don't think anyone mentioned Mirror's Edge. I love it and it has lots of nice tings, but what I would like to mention is amazing sense of movement present in the game. It has a view from the eyes (first-person perspective) but what is really mind-blowing is camera work and the fact that you can actually see your hands and legs in many situations (like when you fall, grab something, etc.) I wish there were more games trying to do something similiar. Especially in shooters you rarely see anything but an absolutely steady gun in your own hands and in some games you have FPP view, but you never see any part of your body, which feels so weird...

And I can understand grape1829, when (s)he mentioned Lineage. It mostly depends on player how much immersed in the game (s)he is. Sometimes very little can move one's imagination and create an epic experience that will give you thrills long after going AFK ;)

Ultima VII: The Black Gate
Baldur's Gate
The Elder Scrolls III: Morrowind
EverQuest

These games all really sucked me right into their worlds. Each one was a very memorable experience.

Thief, Stalker, Condemned: Criminal Origins...

I have to say the first Mass Effect.

I had chills running up my spine when Shepard first spoke with Sovereign: http://www.youtube.com/watch?v=R_NAoNd4YyY

I remember realizing that literally everything was at stake and I think that's what allowed me to be drawn into the setting. The main character in any game has a profound effect on the world around him, but the story in Mass Effect took it to a whole new level for me.

Quite possibly Ultima 3, Dungeon Master, Ultima Underworld, Elite and Doom.

Not because they are technically the closest to virtual reality or anything, but because when playing them, I was in a tender age, and they were there first immersing you into their gameworld.

I mean, come on! In the beginning of UUW, you just see the closed dungeon door behind you, darkness in front of you, and the only way is down, with no idea whatsoever what is waiting you there in the darkness.

A.D.O.M. (Holds up well, even with such basic graphics)
Betrayal at Krondor (I'm not sure how this one would hold up)
Knights of the Old Republic
Red Dead Redemption
Arkham Asylum
L.A. Noire
Mass Effect 1 & 2 (have not played 3)
Clive Barker's Undying
No One Lives Forever (woud like to play the second one. Don't own it. Can't find it.)
Persona 3 Portable (I'm not usually a JRPG guy, but damn)
Final Fantasy XII (same comment as for Persona 3)
I agree with Morrowind, and Oblivion to a slightly lesser degree (have not played Skyrim)

Freespace 2
Thief games
Operation Flashpoint: Cold War Crisis
ME1 and 2
Tome4: Tales of Maj'Eyal
HoMM3

Probably will be adding BG2 to the list soon, just installed it and I can already tell it has that "vibe"

Deus Ex

the game just has this dark, gritty atmosphere that makes it feel like you're really living in a very messed up future. Being able to read newspapers, books, and other character's e-mails really enhances the experience too. And to top it all off it has a sweet-ass soundtrack.

Human Revolution does a pretty good job of drawing you in too. It's more or less what I pictured a cyberpunk world would look like.

Mafia: The City of Lost Heaven

The first time I had the feeling that I was going through a real whole city, rather than just a series of consecutive levels.

I'm starting to feel homesick... :)

I usually don't think much about immersiveness in a game, but I suppose I'd have to say the games where I felt most connected to the characters were Deus Ex, Metroid Prime, and Baten Kaitos: Origins. It makes me laugh when someone tries to "increase immersion" by giving you a blank character with no defined personality, as all it typically does is make your character feel like a Mary Sue.

Another World
Batman: Arkham Asylum
BioShock
Cave Story
Dungeon Master
Final Fantasy VII
GoldenEye 007
Grim Fandango
Heart Of Darkness
It Came From The Desert
The Journeyman Project 2: Buried In Time
La-Mulana
The Legend Of Zelda: A Link To The Past
The Legend Of Zelda: Ocarina Of Time
Limbo
Max Payne
Metroid Prime
Portal 2
Resident Evil
Resident Evil 4
Super Metroid

Guild Wars
The Elder Scrolls 3-5
Hardwar

I don't know if "immersive" is the right word, but "all-consuming" fits for a few strategy games, too:
Empire Earth
Rise of Nations
Civilzation (all of them)

I've lost many days to those games.
Oh yeah. And Thief The Dark Project.
And Batman Arkham Asylum

(people keep reminding me of some great games!)

Worry not, I didn't get it either. There are too many immersion-breakers like enemies that spawn at the same rate you kill them (particularly annoying when they are sitting on a transition point), shitty and repetitive voice acting (the 99 Rads receptionist guy and the scientist bloke spring to mind), the AI, bugs, the faction missions in Clear Sky and those goddamn loading times. I tried to like Shadows of Chernobyl and failed. I tried to like Clear Sky, but bugs and loading times meant I never got round to finishing it. I doubt I'll give Call of Pripyat a go.

On topic: Planescape: Torment, Baldur's Gate I and II, Mass Effect 1 (not ME2, though), Morrowind, Portal, The Witcher 2, Metroid Prime and pen-and-paper Dungeons & Dragons.