God, this is gonna be tough.
2600- Megamania
Intellivision- Microsurgeon
Colecovision- Galaxian
NES- Only one? Okay... I guess I'll go with either Kid Icarus or Bad Dudes (Can't decide)
Master System- Alien Syndrome
Turbografx-16- Blazing Lazers
Genesis- Sonic the Hedgehog series
Neo Geo- World Heroes
Super NES- Legend of Zelda: Link To the Past
Sega CD- Snatcher
Jaguar- Alien vs. Predator
Sega 32X- Star Wars Arcade
3DO- Super Street Fighter II Turbo
CD-i- Vouyer (...)
Saturn- House of the Dead
Playstation- Crash Bandicoot 3: Warped or FF VII or Castlevania: SotN
Nintendo 64- Conker's Bad Fur Day
Dreamcast- Hydro Thunder
Playstation 2- GTA: Vice City (San Andreas is good too, as is III, but the sountrack and plot puts this one over the top for me)
Xbox- Halo 2
Gamecube- Super Smash Bros. Melee
Xbox 360- F.E.A.R.
Playstation 3- Virtua Fighter 5
Wii- Rayman: Raving Rabbids
Game Gear- Sonic Chaos
Game Boy- Pokemon Yellow
Game Boy Color- Pokemon Crystal
Game Boy Advance- Pokemon Emerald (I really like Pokemon)
DS- Cooking Mama (It's so brilliantly WTF)
PSP- Metal Gear Solid: Portable Ops
...shrimp stew, shrimp soup, shrimp in potatoes...
I'm a hardcore collector.