I have played only 2 civs - the original which is really good and TOT which is even better. It took me about an hour to get into it(TOT) and I was playing seven or eight hours non-stop before I knew it. I don't know about you, but if this isn't an addictive game then I don't know what is. You also get several different games whcich all work extremely well. To be honest I have only been playing for a couple of weeks and I only have the original to compare it with but I think this is really good. Mind you, anything makes the Original look poor. I didn't really like the fantasy scenario but I really enjoyed the SCIFI scenario. I also found the Extended Game quite enjoyable but I couldn't colonise the new planet, which annoyed me a bit. It told me the spacecraft had arrived and then - nothing. The SCIFI worked just fine and so did the Fantasy one.
Can someone please list the differnces between the various games?