The principle of SimCity is simple: build it and they will come. Establish a city on an empty plot of land, provide infrastructure and zoning, then sit back to watch it grow. While that core gameplay loop is fun, it is quite short. However, it almost ends up feeling more like a tech demo or proof of concept than a fully-featured game.
At the time this article is written, RollerCoaster Tycoon has had two released sequels, with RollerCoaster Tycoon 4 slated to come out at the end of 2015. Two other theme park games are also in development, Parkitect and Planet Coaster, and are slated for release in 2016. So the question becomes: “Why is RollerCoaster Tycoon still worth playing?”
Answer: “It’s just fun!”