Millennium 2.2 could be it... no, it's Elite1... but...
Bah, I do not want to pick any single game:
Millennium 2.2
Elite1
Elite Final Frontier
Barbarian1 (psygnosis)
Defender of the Crowm
Railroad Tycoon
Deuteros
Foundation
SimCity2000
Civilization
F/A-18 Hornet
Boulderdash
BubbleBobble
....
They all gave some special moments...
Then there were the multiplayer games: Stunt car racer, fire power, TurboRaketti...
aaaargh.... all those nostalgia feelings, they almost make me cry ... I wish I had time to play them again someday