RollerCoaster Tycoon - Platform: XBox

Picture guest:
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Enter "Chris Sawyer" as a guest name to have them walk around and take pictures 
of your park.

Painting guest:
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Enter "Simon Foster" as a guest name to have them walk around and paint pictures 
in your park.

Waving guest:
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Enter "Katie Brayshaw" as a guest name to have them walk around and wave to 
everyone they meet.

Hungry guest:
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Enter "Tony Day" as a guest name.

Happy guest:
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Enter "Melanie Warn" as a guest name.

Double payment for rides guest:
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Enter "John Mace" as a guest name.

"Wow!" thinking guest:
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Enter "John Wardley" as a guest name.

Faster Go-Karts:
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Enter "Damon Hill" as a guest name. Enter "Michael Schumacher" as a guest name 
to race even faster.

Slower Go-Karts:
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Enter "Mr Bean" as a guest name.

Rich guests:
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Enter "Richard Branson" as a guest name.

Pick pocket:
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Enter "Richard Tan" as a guest name.

Multiple names:
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You can have more than one person with the same name (which works well when 
using the cheats) by changing the capitalization of various letters. For example 
"Chris Sawyer" can be used on another person by making all letters lower or 
upper case ("chris sawyer" and "CHRIS SAWYER").

Mega Park:
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Successfully complete all levels to unlock the Mega Park.

Helping sick guests:
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Place plenty of benches near the roller coaster exit paths. Sick guests will sit 
there after the ride, allowing them to eventually feel better. Also place 
benches by snack bars. Additionally, pick up sick guests and let them sit like 
that for a while.

Clapping guests:
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Before you complete a mission go to a location that has a lot of guests. When 
the mission is over they will all start to clap.