for me it was:

NES- Super Mario Bros. 3

Atari Lynx- California Games

Atari Jaguar: Cyber Morph

PS one: Star Wars: Dark Forces

Nintendo 64: Mario 64

Dreamcast: Sonic Adventure

Playstation 2: Tony Hawk 3

Xbox: Halo

Super Nes: Super Mario World

Gamecube: Resident Evil remake

Xbox 360: Elder Scrolls Oblivion

Wii: Mario Galaxy

Gameboy advance: Some Crash Bandicoot game i cant remember the name of

Nintendo DS: Brain Age

PSP: Luminies

PS3: Metal Gear Solid 4

Interested to hear what your guys first game for each system was.

And here...we... go.

SNES: Super Mario World
N64: Mario Kart 64
PS1: FFVII/MGS1
XBox: X-Men Legends
360: TMNT (XBLA) and R6:V (Retail)
Wii: Wii Sports (haha)

Gameboy: Tetris
DS: Mario Kart DS

That came packaged with my Jaguar. If you're gonna include the default games, how about

Atari 2600: Combat

ATARI- COMBAT (IN BOX), BREAKOUT

INTELLIVISION- SOME KIND OF FOOTBALL

COLECOVISON- DONKEY KONG (IN BOX), MR. DO or MOUSETRAP

NES- NOT SURE WHICH NINTENDO IT WAS, BUT SUPER MARIO BROS. I BELIEVE

Atari 5200- PACMAN (I THINK)

GENESIS- GOLDEN AXE & ALTERED BEAST

PS- TOMB RAIDER

N64- SUPER MARIO 64

DREAMCAST- NFL 2K

Playstation 2: DON'T REMEMBER

Xbox: HALO:CE

Super Nes: DON'T REMEMBER

Gamecube: MARIO KART DD

Xbox 360: OBLIVION

Wii: SUPER MONKEY BALL BB

Gameboy advance: DON'T REMEMBER

Nintendo DS: MARIO KART DS I THINK

PS3: RESISTANCE: FOA- The only game I've played on the PS3

This will be slightly tough, I think. Especially for the older systems.

NES: Aside from my SMB/Duck Hunt pack-in, I didn't get anything the first time around. I got mine pretty late (summer '89), which means that I probably got a few as presents in Christmas. My guess? SMB2 and the first TMNT game.

SNES: This one's easier, I think. I got it with SMW and I think my first game was SimCity. I still remember being at swim practice doing laps, thinking about what upgrades I wanted in my city and when I would have enough for a stadium.

Nintendo 64: Embarassingly, Cruisin' USA.

Dreamcast: Ikaruga, I think.

Xbox: Was Halo a pack-in? I think when I bought the Xbox I bought Halo, Oblivion, and one other game.

PS2: I got a PS2 strictly because a roomate was moving out and I didn't want to lose my GTA or THPS3 saves. I think when I bought it, I also bought Twisted Metal Black.

Xbox 360: Call of Duty, PGR3 and Kameo.

DS: A ton of stuff. I had gotten about 20 games within the first six months of the DS. I definitely got Mario Kart and NSMB the first day.

Wii: Tony Hawk's Downhill Jam and fucking Monkeyball. Monkeyball was traded in the next day. I actually camped out in front of the store. I could not get wait to get rid of that wretched game. And I liked the GC one.

PS3: Bought it for a Blu-ray. First game I got was Ratchet & Clank Future. To date, I've still only bought three games for it.

this is a good question....

NES - Maybe Super Mario Bros.
SNES - Super Mario World
N64 - Super Mario 64
Playstation - Tekken
Xbox 360 - Oblivion
Wii - Zelda

Oblivion is a 360 title.

Whoops. I meant Morrowind.

(Not including pack in games)

NES: Batman
Sega Genesis: X-Men
SuperNes: Pilot wings
Gameboy: Punisher
PS1: WWF Warzone
PS2: WWE Smackdown (whichever the first ps2 one was)
Dreamcast: Zombie's Revenge
Xbox: Dead or Alive 1/2
DS: Trauma Center
PSP: Ridge Racer
360: Perfect Dark
PS3: Heavenly Sword

I want to play that so bad. I never got it because I didn't think I'd like it, but after playing Oblivion I wish I would've. Now I think it would seem pretty dated.

NES- Super Mario Bros. 2

PS one: Can't remember

Nintendo 64: Mario 64

Dreamcast: NFL 2K

Playstation 2: NCAA Football

Xbox: Madden

Super Nes: Super Mario World

Gamecube: Madden

Xbox 360: Madden

Wii: Zelda

Gameboy advance: Super Dodgeball

Nintendo DS: Super Mario DS

PSP: NCAA Football 07

PS3: NBA 2K7

Atari 2600 - Street Racer
ColecoVision - Venture
Intellivision - Microsurgeon
Atari 1200 computer - Murder on the Zinderneuf
NES - Golgo 13
Genesis - Herzog Zwei (still one of the best games EVER!)
SNES - Mega Man X
3DO - Return Fire (we need a next gen version of this)
PS - Twisted Metal
PS2 - DOA 2
PS3 - Full Auto 2

ATARI 2600 - Combat
NES - Super Mario Bros.
ATARI 7800 - Pole Position
GENESIS - Mortal Kombat
SNES - Mario Kart
PLAYSTATION - Ridge Racer
SATURN - Sega Rally / Daytona / Virtua Fighter bundle
3D0 - Wing Commander III (?)
N64 - Super Mario 64
DREAMCAST - Crazy Taxi
PLAYSTATION 2 - Gran Turismo 3 & Half Life
XBOX - Halo
GAMECUBE - Eternal Darkness
PLAYSTATION 3 - Resistance & Gran Turismo 5: Prologue

Sega Genesis (bundle) - Sonic 1 & 2
Playstation - Tekken 2
Playstation 2 (launch) - Madden 2001, SSX, Smuggler's Run
Xbox - Knights of the Old Republic
Gameboy Advance - Super Mario Advance, Tony Hawk Pro Skater 3
PSP (Costco Bundle) - Hot Shots Golf :Open Tee, ATV Offroad Fury : Blazin' Trails
Nintendo DS - New Super Mario Brothers
Xbox 360 - Gears of War
PS3 - Motorstorm (after about two months of owning the system, certainly a first for me).

Cool idea, but all you N64 people must not have gotten your system at launch since Mario 64 was the only game for a while.

*Atari 400 - Joust
*NES - Super Mario Bros. (duh, it was a pack in)
SNES - Super Mario World, F-Zero
N64 - Mario 64
*Xbox - Halo
Gamecube - Luigi's Mansion, Rogue Squadron II, WaveRace, Super Monkey Ball
Xbox 360 - COD2, PD0, Kameo, Condemned
Wii - Twilight Princess, Rayman Raving Rabbids, Super Monkey Ball
*PS3 - Motorstorm
DS Lite - New Super Mario Bros.

*Only systems not bought on launch day. Well technically I bought a PS3 on launch day but sold it to a friend who wanted it more than I did. Didn't buy my own until a year later.

I am surprised I can't remember some of these.

NES, SNES, Saturn - don't remember
Gameboy - Super Mario Land
PC (Atari ST) - Dungeon Master, Blood Money, Shufflepuck Cafe, various Llamasoft
Genesis - Sonic (but that might have been included by then)
Game Gear - Sonic
Playstation - Tekken, Lemmings
N64 - WCW vs NWO Revenge
Dreamcast - Shenmue
Playstation 2 - GTA 3
Gameboy Advance SP - Super Mario Advance 4: Super Mario Bros 3
Xbox - Knights of the Old Republic
Xbox 360 - Assassin's Creed

NES- Don't remember
SNES- Was Super Mario World a pack-in title? I can't remember. I just remember playing it first.
Nintendo 64- Mario Kart 64
Wii- Super Monkey Ball BB (Sold Wii)
Game Boy Color- Pokemon Blue
DS Lite- New Super Mario Bros (Sold DS)

Game Gear- Don't remember
DreamCast- Crazy Taxi

PS2- Final Fantasy X
PS3- MLB 08 The Show
PSP- Patapon

Intellivision - Frog Bog?

C64 - Master of the Lamps (probably not the first, but the most memorable)

SMS - Space Harrier (packed with Super Hang-On and some light gun game)

NES - Super Mario Bros 3

fast forward...

N64 I co-opted - Ocarina of Time

PS2 - Madden 01 (but it was Dragon Warrior VII for the PS1 that made me want the thing in the first place)

GBA - Dragon Warrior I&II (GBC)

GCN - Rogue Squadron

Xbox - Knights of the Old Republic

DS - Super Mario DS (packed-in)

Wii - Twilight Princess

360 Retail - Blue Dragon

360 XBLA - Pac-Man: CE

PS3 - N/A still

Jesus Christ I can barely remember what I had for dinner last night.

PS3: I got some with my console (Craigslist): NCAA Football 08, Smackdown vs. Raw 2008, Resistance. First one I bought with my own money was MLB 08: The Show.

X360: First time I think I bought it with Fight Night Round 3 and PGR3. I think. Second time I got it from Craigslist. I got Halo 3, Oblivion GOTY, Gears of War and Bioshock with it. I don't remember what the first game I got for it with my own money was.

PSP: I got like 6 or 7 games on launch, so no luck there.

DS: Meteos and Advance Wars (first one)

GBA: Castlevania: Circle of the Moon

Dreamcast: Came with Sonic Adventure, I think.

GCN: I got it for Christmas with Luigi's Mansion and a few other games I can't remember.

SNES: Street Fighter II

That's about all I can remember. PS2 and Xbox I got for my birthday and cannot remember what I got with them.

NES: Super Mario Bros/Duck Hunt (duh)...cant remember what else
Game Boy: Almost has to be Tetris.
SNES: I inherited this, so there were a few...definitely the Lion King game and Mario Paint.
PS1: WCW vs. the World/NBA Live 98
PS2: WWF Smackdown: Just Bring It!
Game Boy Advance: Mario & Luigi: Superstar Saga
Gamecube: Super Mario Sunshine/Animal Crossing
Nintendo DS: New Super Mario Bros./Brain Age
Xbox 360: Madden 08

360: Gears of War and Rainbow 6: Vegas

Atari 2600: Combat!
NES: Super Mario Bros. / Duck Hunt
Genesis: Sonic the Hedgehog
Xbox: Halo & Dead or Alive 3
Xbox 360: Madden
Dreamcast: NFL 2K
Gameboy: Tetris
Playstation: Final Fantasy 7
Playstation 2: I seriously can't remember...
Nintendo DS: Animal Crossing
SNES: Donkey Kong Country
Gamecube: Animal Crossing
Wii: WiiSports

A ton of those came with the system, but a fact is a fact.

Self contained Pong game: Pong
Sears Video Arcade: Combat
NES: Super Mario Bros.
Gameboy: Tetris
SNES: Super Mario World
TurboGrafx 16: Keith Courage
PlayStation: Battle Arena Toshinden
PlayStation 2: FantaVision
Dreamcast: Hydro Thunder
XBOX: Halo
Gamecube: Wave Race
Sega Game Gear: Columns
Gameboy Advance: Castlevania Circle of the Moon
Nintendo DS: Super Mario 64 DS
Xbox 360: Call of Duty 2
PSP: Lumines
Wii: Excite Truck
PS3: Resistance Fall of Man

Somebody forgot all about Pilotwings 64.

NES: Gyromite/Duck Hunt

SNES: Super Mario Land

Genesis: Sonic the Hedgehog 2

N64: Donkey Kong 64

Playstation: Breath of Fire III/WCW Nitro

Playstation 2: Grand Theft Auto Vice City/Kingdom Hearts/Metal Gear Solid 2

X-Box: Halo/Unreal Championship

X-Box 360: Kameo/Perfect Dark Zero/Condemened/Call of Duty 2

PS3: Resistance

Wii: Wii Sports/Zelda: Twilight Princess

PSP: Daxter/La Pucelle Tactics/Parappa Tha Rappa

Nintendo DS: Tetris/Metroid Prime: Hunters

Game Boy:Tetris/Mega Man