[andrewas]

only the top five? OK. Lets see.

UFO - enemy unknown (aka "X-COM - UFO defence").On PC. Real time resource management, turn based tactical combat. With big explosions, freaky aliens and crap graphics. Best game ever.

Elite+ . PC, moslo'ed. Although all versions are good. Archimedes version is reputedly the best, although there are no good emulators. Has anyone not heard of this one? Best game ever.

Transport Tycoon. PC. railroad tycoon and suchlike are good games, but this one just has that something that they lack. A depth of play that got lost with the later games. Crap graphics though.

X-Wing. PC. Space combat simulator. One of the harder games out there. I dont know many people that beat this one honestly. I barely did it myself. never did get the B-wing expansion finished.

Civilisation. PC. CivII may be better technicaly, but Civ was the original that I grew up with. Used to be able to get to alpha centauri in an afternoon, but only on easy.