First game played: There's no way for me to be sure. But if I were to guess, it was something for the Atari 400 or Atari 800 PC, and most likely Pac-man, Missile Command, or Joust.
First system and game owned: The first system specifically gotten for me would be the NES with SMB/DuckHunt pack-in. I can't be sure of the year.
First game you ever bought: I can't be sure, but something for NES I would guess. Maybe Mega Man 4 was the first game I spent my own money on. But I can't be sure as this was ages ago.
First FPS you ever played: Doom or Descent. Unsure of which. I'd say Descent is more likely.
First game beaten: Super Mario Bros ofcourse. Atleast that would be my guess as I have no specific memory of this. I've been playing video games since before memorys were really being made.
First used game you've bought: Again, no clue, but probably something for NES.
First new system you've bought: The first new system that I bought myself was the Nintendo 64. It was a blast. However after getting it, I also bought a Playstation and then later the DreamCast.
First PC game bought/owned: Doom Shareware on 2 Floppy Disks, most likely.
First used system you've bought: I would guess a used NES system. If not, the Sega Genesis is the next most likely.
First RPG: The first RPG I actually played deeply and beat was Final Fantasy II for the US SNES. Awesome game. Wish I still had the cartridge, not that the lack of it bars me from playing it.
Game that brought you to an online community: Zelda Classic maybe. But more likely it wasn't a game but an emulator or rather a group of emulators that brought me onto the internet forums. Nesticle, Callus, Genecyst, and ZSNES are that group of emulators.
First game bought for a system you don't own: Hm, I don't know about this one. But I do know I bought Street Fighter II' Champion Edition the arcade game long before I built a system to play it on.
While we are asking about firsts, how about adding these:
What are the first 3 NES games you played?
First 3 SNES games you played?
First 3 N64 games you played?
First 3 PS1 games you played?
First 3 Genesis games you played?
First 3 Saturn games you played?
First 3 DreamCast games you played?
First 3 GameBoy games you played?
Mainly I wanted to add the one about the SNES.
The first 3 SNES games I had and still have to this very day are Super Mario World, Super Mario Kart, and StarFox. Superb games. And I remember they were followed by Super Mario Allstars, Mega Man X, and Street Fighter II Turbo.
The first N64 game I played was no doubt Super Mario 64, but I imagine most anyone that bought the N64 early on will say that. I remember playing Shadows of the Empire early on too. But probably the first game I bought for N64 was StarFox 64. I can't remember the order in which I bought anything else though.
The first Playstation games I played I'm not sure, though I know Metal Gear Solid and Star Wars Masters of Teraskaski or whatever it was were probably the first couple. The first game I bought was no doubt Mega Man X4. Still have it to this day ofcourse.
First DreamCast games I got were Sonic Adventure and Marvel Vs Capcom. Both sweet games. Great but short lived system.
First 3 Gameboy games I can also name the exact three I bought. Zelda, Pokemon Blue, and Metroid II. This is due to them being the only 3 games I owned for the longest time. However before buying them I had played Tetris and Super Mario Land atleast.
First 3 Genesis games I played were probably all Sonic games. Can't be sure. But early games I played were Sonic, TMNT, and Predator 2.
First 3 Saturn games I played were probably Mega Man X4, Darius Gaiden, and Nights into Dreams.