Question 1

How many copies has RollerCoaster Tycoon sold?

Accepted Answer

719,535 copies (as of December 1999; Source: Computer Games Strategy Plus).

Question 2

What was RollerCoaster Tycoon's all-time peak of concurrent players on Steam?

Accepted Answer

1,223 players (as of March 2020; Source: SteamCharts).

Question 3

How long was RollerCoaster Tycoon in development (months)?

Accepted Answer

24 months (as of January 2000; Source: Computer Games Magazine).

RollerCoaster Tycoon in numbers

How many copies of RollerCoaster Tycoon sold in North America in 1999?

Metric	Number	Date	Source
Copies soldNorth American sales in 1999 (PC Data); best-selling game of 1999	719,535 copies	December 1999	Computer Games Strategy Plus
Peak concurrent players (Steam)All-time Steam peak (SteamCharts) · Steam version, only tracked since 2012	1,223 players	March 2020	SteamCharts
Development timeDevelopment time "two years", according to Chris Sawyer	24 months	January 2000	Computer Games Magazine