Nickelodeon Party Blast

Secret characters:
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Go into Blast, then press [Down] [Down] [Right] [Left] [Right] [Up]
[Left] [Down] [Right]. Then, go to the character selection screen. 
Cosmo, Wanda, Patrick, and Carl Wheezer will now be unlocked.


Unlock the Clam games:
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Go to Blast, then press [Up], [Up], [Down], [Down], [Left], [Right]
to unlock the levels for the clam games.


Pizza:
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In the Rugrats Food Fight levels. go on top of the fridge to get 
the pizza.


Unlock the Bungi games:
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Highlight the Bungi game at the bottom of the game selection screen,
then [Up], [Up], [Down], [Down], [Left], [Right].