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First of all it depends on how big your backyard is. If it's very small, then you really can't do anything. If you don't even have one, then you obviously can't do anything. If you have a medium backyard, get one of those K'Nex Kits on how to build a roller coaster and you should be done within two hours (that's how long it takes for me to build them) If you have a large backyard, maybe even bigger than your house, then you can build a small one. If you have a celebrity's backyard, you can do just about anything. You cannot, however, build one like Phineas and Ferb. I am sorry.

Ok. You got a backyard big enough for a baby roller coaster. This rollercoaster will not be one of those fancy rollercoasters you see at Universal or Disney. It will be a baby one. Get a track. Then a shopping cart. Whee!

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13y ago

What else can I help you with?