Rollercoaster World simulates theme park management and roller coaster design, featuring both a "Management mode" and a "Challenge mode".
In the Management mode, the player creates and manages their own theme park. In the park, the player builds roller coasters, amusement rides, and amenities for visitors such as fast food restaurants and toilets.
The Challenge mode has five levels, the player create a roller coaster while observing the safety, g-force and speed limits. The player can create several different types of roller coasters in both modes - including: Out & Back, Inverted and Suspended.
Source: Wikipedia, "Rollercoaster World", available under the CC-BY-SA License.