S.Peelman on 04 December 2017
Most likely Rollercoaster Tycoon 2. I have played that pretty much non-stop since it released. It's too bad those old games don't tell time, but it has got to be like 10,000 hours or something. I actually should try to make an educated guess in some way, could be interesting. Probably relatively not that far behind is SimCity 4, closely followed by Anno 1602.
