I used to be SOOOOO addicted to all of the various Civ games.
I remember the original as a teenager. One of my dad's friends wanted to try it, so I dropped it off at his house one night at like 8-9PM and spent an hour or so showing him how to play. I talked to his wife the next afternoon, he played it until half an hour before he had to go to work..........at 6AM.
He was already playing it when she got home that night too.
