Their are multiplayer servers to play on so you can survive with other people around the world, are fight them to the death.
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Roller Coaster Tycoon 3 is a tycoon where you can make your own park. They have different extra packs you can get like making a pool our zoo. You can make your own, custom roller coaster our get a one made for you. If you want to make your dream park you can go into sandbox mode were you get infinite money and tons of people coming into your park even if you dont have anything. When your making your roller coasters you need to test. There is 3 things you need to get in a range to get more people on your coaster. 1 nausea, if its to high most people wont go on the ride. 2 intensity, same thing, cant have it to high. 3 excitement, Try to get this high so people want to go on your roller coaster.