Sequels

Due to the success of the first game many sequels were created resulting in the creation of the rollercoaster tycoon franchise :

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RollerCoaster Tycoon 2

RollerCoaster Tycoon 2 was released on October 15th 2002. The game was developed by Chris Sawyer and published by Infogrames Interactive.
RollerCoaster Tycoon 2 has two official expansion packs: Wacky Worlds and Time Twister, both released in 2003 and had no involvement from Chris Sawyer, instead being handled by Frontier Developments. The Combo Park Pack edition contains the original game and the Wacky Worlds expansion. The Triple Thrill Pack contains the original game and both expansions.

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RollerCoaster Tycoon 3

RollerCoaster Tycoon 3 was released on November 2nd 2004 in North America. Although the core features of RollerCoaster Tycoon 3 are based on the previous games, Chris Sawyer, the developer of the first two games, acted only as a consultant. The game was developed by Frontier Developments instead, and published and advertised by Atari Interactive featuring a completely different structure.

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RollerCoaster Tycoon World

RollerCoaster Tycoon World was developed by Nvizzio Creations for Atari Interactive and RCTO Productions and released on 16 November 2016. The installment is different from previous games in that players build coasters with a spline-based system. It also introduced a new "Architect mode" and "safety-rating" options when building coasters. The game is also the first to incorporate the Steam Workshop.