Rather than trying to build complex rides with a high excitement rating, copy rollercoasters from the already existing parks, since most of the prefabricated parks have rollercoasters that have very high excitement ratings already. To do this, Click on the rollercoaster that you wish to save. With that ride's window still open, click the "File" button at the top of the screen. Select the "Save Track Design" option Then, press save when the window opens. Next, go to the "Build" menu and select the type of coaster you saved. The new coaster is now there and can be built if you have enough money. Since there are not ten coasters in the other parks with high excitement, you can duplicate the small ones like the "Limit" coaster, then change the name and color. Your guests will treat it like a brand new coaster.