Terror from the BUMP

Biggest impact? Hmm, difficult.

I'd have to go for Ultima Underworld (yes, I am that old). I'd been playing games before, but this one really had everything (I agree that maybe it didn't age that well): story with a twist, atmosphere, gameplay.
Having said that, I feel I also have to mention System Shock and Deus Ex. So much more than just games...
Ahhh, the memories...

Titles like that made me realize that there is art, beauty, emotion in games and that people who say games are for children or games dumb you down really have no clue.

3 page?! INEXCUSEABLE!

A legit bumb.

I am not finnished bumping yet :D

Not in, but I think it was Baldur's Gate. It was the first real RPG that I have played. Also I remember running around saving/loading for hours to kill Drizzt by backstabing him with a low-level fighter-thief :).
And after that Fallout. I remember them both fondly. The first time I've played Fallout, I remember meeting the Master's goons and letting them take me to the Military Base fairly early on. And there dieing a couple of times :D... anyway those were the times when games were complex, compared to the dumbed-down, linear, hand holding shit we're seeing today.

Tha game that had the biggest impact on me was Pacman. It was THE game. Everything was perfect, and even so far I remember the music in my head. It was the beggining of my ludopathy.

Bumpy Impact

Doom. The first game to actually scare me!

Not in but +1

Diablo 1. Started me on a downward spiral with ARPGs.

The Witcher collector's edition. It fell off the shelf and hit me corner-first in the forehead.

Not in.

I'm in! TY!

My answer is: Baldur's Gate

Not in. I can't say which game had the biggest impact on me, though it would probably be Ballerium (a failed MMORTS), because I worked on it. But here are some games which were memorable:

Home Pong: Introduced the idea that you could hook up a device to your TV and have fun playing on it.

Those digital calculator watches with the number game: Introduced me to mobile gaming. Spent tons of time playing that game instead of listening at school.

Sentinel on the C64: A real 3D game, not using wireless graphics, and where the 3D really mattered.

Nine Princes in Amber: Zelazny's Amber adventure game, with graphics, sound and some animations, what could be better?

Tomb Raider: Introduced me to the value of bilinear filtering.

Quake: Showed me that SGI machines could be used for gaming, and that they can make games look good.

Terminator: Future Shock: Introduced mouse look. The moment I experienced it I knew I couldn't go back to an inferior control scheme.

Wii Sports: The alternate control method of the Wii was a great revelation regarding where gaming can go.

Broken Age (Double Fine Adventure): While not out yet, if there was one game which had a real impact on me in recent years it's this game. It introduced me to Kickstarter, which in turn got me to dabble a little in creating games (though I stopped that for now, due to lack of free time).

That's just a subset of the games. I have to say that a game being memorable or having an impact doesn't mean I thought it was great, let alone that I finished it. I didn't like Quake that much, and though I liked the others, I never finished Tomb Raider, played only a little Terminator, and from this list only finished Nine Princes in Amber. Granted many of these games can't be finished, and I did play them quite a bit. Sentinal for example had 10,000 levels, and I got past level 5,000 (it skipped levels based on how finished each level, but it still means I played hundreds of levels).

Not in, but thanks for your generosity, Palvikinkku!

About your request: so many of them! :D

I lived the age when many of the well-known genres of today hadn't been established yet and had the luck to play some of the precursors. Most of my preferences in gaming date back to those times. Point'n'click adventures like the Sierra (and specially) Lucasfilm ones, RTS like the first two Dune titles, too many simulators to mentioning them here (though Wing Commander and Strike Commander series spoiled me, since then I need a campaign-driven story to enjoy them), shooters like Wolfstein, Doom and Quake...

Good times for gaming...

... same as now. ;)

Doom. It was the first FPS I've played, and to this day, I think that's how they should be done.

Thanks for XCOM!