That's the whole point. 1 game per system you can think of. Makes it more interesting to see the specific game you decide per system tou can think of. Some systems such as Amiga or Playstation I don't know if I can pick any one game. Sometimes it just comes down to the first game that comes into your head.

For me I will start listing some and and add to my list as I think of more.

Playstation One: Final Fantasy VII
Dreamcast: Soul Calibur
Amiga: ?
Atari ST: Dungeon Master
SNES: Zelda: A Link to the Past
Amstrad CPC: Gryzor
ZX Spectrum: Knight Lore
Acorn Archimedes: Zarch
BBC Micro: Elite
Atari 2600: Combat