Nickelodeon Party Blast Cheats

Secret characters
Go into Blast, then press [Down]x2, [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 Bungi games
Highlight the Bungi game at the bottom of the game selection screen, then press [Up]x2, [Down]x2, [Left], [Right].

Unlock the Clam games
Go to Blast, then press [Up]x2, [Down]x2, [Left], [Right], to unlock the levels for the clam games.

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

Easy wins
Try to lose racing levels several times and your opponents will also start to lose theirs. Once they do, try to win (it will be much easier).