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Gamecube - Universal Studios Park Adventure cheats

Unlock attraction mode option:
First you have to collect all 8 stamps. Then go to the globe and speak with 
Woody Woodpecker. Choose the magic show when you talk to him. 
Allow the credits to finish, then go back to the title screen to select the 
attraction mode. 

Night mode:
Complete give attractions

Easy 100 points:
Watch the Waterworld Show. Repeat as many times you want 
to get additional 100 points again.

Getting money easily:
Walk in the park, picking up trash and throwing it away.