In the RollerCoaster Tycoon universe, expansion packs are addons for the base games (RCT, RCT2 and RCT3). The addons for the first two games didn't change gameplay at all, as they were only added new features and rides. The third game added completely new ways to play the game.
- RollerCoaster Tycoon (1999)
- Corkscrew Follies/Added Attractions (1999)
- Loopy Landscapes (2000)
- Compilation RollerCoaster Tycoon: Gold (also known as Totally RollerCoaster in the UK) (2000); includes original game and both expansions
- Compilation RollerCoaster Tycoon: Deluxe (2000); includes original game and both expansions with more designs for different ride types
- RollerCoaster Tycoon 2 (2002)
- RollerCoaster Tycoon 3 (2004)