On platforms I've owned.
Amstrad:
Gauntlet, so addictive and basic but awesome.
PC:
Command and Conquer, a defining game which was truly amazing and set the precedent for any war game available.
Mega Drive:
Sonic 2 or Fifa 95.
PS1:
MGS, FF7 and Fifa 98; remember the bendy arrow for corners where you could score, fouling the keeper too!!!
Xbox:
Halo - hands down, my favourite game ever.
PS2:
PES3 defined football games as they are now for me.
Xbox 360:
Halo 3 or Guitar Hero 3.
PS3:
Fifa 10 or COD6.
Overall it is split for me between Final Fantasy 7 and Halo, both are games I constantly go back to. Oh and Star wars knights of the round table was thoroughly enjoyable too.
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