Atari: Ms. Pac Man
NES: Mario 3
SNES: Sim City
Sega: Sonic 3 w/ Sonic and Knuckles
N64: Harvest Moon 64
GameCube: Donkey Kong Jungle Beat
Wii: Rune Factory Frontier
PS3: Skyrim

Gameboy: Pokemon Blue
GameBoy color: Pokemon Gold
GBA: Pokemon Sapphire
DS: Pokemon Diamond
3DS: Super Mario 3D land
PSP: Disgaea 2
Vita: Hot Shots Golf

Oh man that's hard no way i can name just one game for each console!

PS1: Resident Evil 2/3
PS2: Ratchet and Clank 3/Jak 3
PS3: Uncharted 3/MGS4
PSP: God of War Chains of Olympus/Ghost of Sparta
PSV: LittleBigPlanet Vita/Rayman Origins
360: Halo 3/Reach

Gameboy: Pokemon Blue
GB Advance: Advance Wars 2
DS: Advance Wars Dual Strike
SNES: Kirby Super Star
N64: Perfect Dark
Gamecube: Metroid Prime
Xbox 360: Halo Wars

Playstation: Final Fantasy VII
Playstation 2: Kingdom Hearts
Playstation 3: Demon's Souls
Playstation Portable: Final Fantasy IV: Complete Collection

Xbox 360: Fable II

SNES: Final Fantasy V
Nintendo 64: Super Mario 64
Nintendo Gamecube: Pokemon XD Gale of Darkness
Nintendo Wii: N/A
Game Boy Colour: Pokemon Crystal
Game Boy Advance: Harvest Moon Friends of Mineral Town
Nintendo DS: Subarashiki Kono Seikai
Nintendo 3DS: Kingdom Hearts 3D Dream Drop Distance

NES: Teenage Mutant Ninja Turtles 2
Genesis: Street Fighter 2
PSX: Final Fantasy 8
PS2: Metal Gear Solid 2
PS3: Metal Gear Solid 4
PSP: Jean D'arc
DS: Final Fantasy Tactics A2
Wii: Zelda: Twilight Princess
SNES: Final Fantasy 6
N64: Zelda Ocarina of Time
Dreamcast: Street Fighter 3: Double Impact
Xbox 360: Halo 4
Xbox: (Never owned but can play games on 360) nothing really
Gamecube (Never owned but can play games on Wii): Metal Gear Solid: Twin Snakes

Vita: Gravity Rush

3DS: Zelda Ocarina of Time

Super Nintendo - Super Mario land
Nintendo 64 - Super Mario 64
PlayStation 1 - Crash Bandicoot 3
PlayStation 2 - God of War 2
PlayStation 3 - Red Dead Redemption/Killzone2/ God of War 3 (i honestly couldnt chose one)
PC - its impossible for me to chose

NES: Super Mario 3
SNES: Super Mario World
GB: Super Mario Land
GBA: Final Fantasy Tactics Advance
DS: Super Mario 3D Land
Game Cube: Mario Kart: Double Dash
Super Mega-Drive/Genesis: Sonic the Hedgehog 3 and the expansion Sonic and Knuckles
PSP: Jeanne d'Arc
PS1: Metal Gear Solid 1
N64: Mario Tennis
PS2: Metal Gear Solid 2
Wii: Super Mario Galaxy
PS3: Metal Gear Solid 4

Xbox: Halo 1
Xbox 360: Halo 3

Atari STE/STF: Captive
PC: UFO/X-COM - Enemy Unknown (the original in 1994) followed very closely by Syndicate

Coleco- Donkey Kong
Atari- Ms. Pac Man
Intellivision- Donkey Kong jr.
Jaguar- NBA Jam: tournament edition
Neo Geo- Metal Slug

NES: Super Mario Bros 3
SNES – Super Metroid
N64 – Goldeneye 007
G.cube – Eternal Darkness
Wii – Super Mario Galaxy 2

GB – Pokemon Blue
GBC - Pokemon Yellow
GBA - Super Mario and Luigi Superstar Saga
DS - Pokemon Black
3DS - Ocarina of Time 3D

Genesis- Sonic and Knuckles
Game Gear- Space harrier….ahhhhhhh…Get Ready!
Sega CD- Final Fight
Dreamcast- Shenmue

PS1 – Metal Gear
PS2 – Grand Theft Auto Vice City
PS3 – Metal Gear Solid 4

Xbox: Unreal Championship
Xbox 360: Call of Duty 4: Modern Warfare

PSP - Metal Gear Walker (modified PSP)
PSVita – My Ass

PC- World Of Warcraft!!! (Quad-Box ^.^) & Rogue Spear

NES: Bubble Bobble
SNES: The Legend of Zelda: A Link to the Past
N64: Banjo-Kazooie
GBA: Castlevania: Aria of Sorrow
GCN: Super Smash Bros. Melee
DS: The Legend of Zelda: Spirit Tracks
Wii: Metroid Prime 3: Corruption
3DS: Super Mario 3D Land
PS2: Ico
PSP: Killzone: Liberation
PS3: Folklore
Xbox: The Elder Scrolls III: Morrowind
Xbox 360: Left 4 Dead
Game Gear: Jurassic Park
Saturn: NiGHTs into Dreams...
Dreamcast: Quake III Arena
PC: Doom II

It's a very hard decision, but here we go:

-SNES: Donkey Kong Country 3
-N64: The Legend of Zelda Ocarina of Time
-Playstation: Final Fantasy VII
-Nintendo GameCube: Metroid Prime
-GameBoy: Mario Land
-Nintendo DS: The World Ends With You
-Playstation 2: God of War 2
-Wii: The Legend of Zelda Skyward Sword
-Playstation 3: Uncharted 2
-Xbox 360: Forza 4
-3DS: Kingdom Hearts Dream Drop Distance