Discovery Kids has a small build your own roller coaster game up on their site. It allows you to drag and drop different pieces of a roller coaster together to build a completed roller coaster. Each different piece of the roller coaster has different loops and apparently a fear factor attached to it. The more crazy loops you add to your roller coaster the more fear you put into the potential riders of the roller coaster. Once you have completed your roller coaster you can then test it to see what the virtual people in the game think of your roller coaster (aka how scary it is). All of the pieces to choose from are pre-created so there is no option to create or upload your own content to the game. It is built in Flash.
Test out the build your own roller coaster game for yourself here.