Although for those who want exactly that, the tools are very much still there to do so. This was a huge selling point for me as I prefer working towards a set goal rather than jumping into Sandbox mode and arbitrarily building rollercoasters. These link together well and have you learn a new mechanic or take on a more difficult challenge each time.
In comparison, RollerCoaster Tycoon 3 has three separate campaigns: one for the base game and one for each expansion pack.
