You can download it here: http://download.cnet.com/Roller-Coaster-Tycoon/3000-7551_4-10026882.html for a 40 minute free trial and then you can purchase it for $20.
Download it from a CD
at yahoo.com
download free roller coaster 3
you have to download it
You must buy it.
i dunno if it works but try search Roller coaster tycoon 3 download
There is no Roller Coaster Tycoon 4 instead it will be Roller Coaster Tycoon 3D for the Nintentdo 3DS.
Every higher version of Roller Coaster Tycoon, has more rides, more scenery and many other things.
put the disc in your computer, and then download.
The internet
Platnum gives you access to Roller coaster tycoon 3, Roller coaster tycoon 3 WILD, and Roller coaster tycoon 3 soaked, If you just buy gold you cannot do anything on roller coaster tycoon 3 WILD like have a zoo and the WILD themed stuff such as deco's and rides.
Not that I know of but there is roller coaster tycoon 3.