I play 1. Well, when I can get it to run on my computer.
Used to spend 2 hours a day at it before my CD drive crashed. I played 2 a couple times, but it's 1 I really like.
PS. Do you also play Roller Coaster Tycoon?
Hehe, I actually named my closet pirate guild after one of my Roller Coaster Tycoon roller coasters.