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You can also ask your question on our Barbie as the Princess and the Pauper Questions & Answers page.
At the Password screen enter the following codes to unlock the corresponding effect.
Unlock Boss 1:
Barbie, Cat, Brown Haired Girl, Cat
Unlock Level 2:
Old Guy, Cat, Dog, Old Guy
Unlock Level 3:
Old Guy, Barbie, Old Guy, Cat
Unlock Level 4:
Cat, Barbie, Cat, Old Guy
Unlock Level 5:
Cat, Barbie, Brown Haired Girl, Barbie
Unlock Level 6:
Cat, Brown Haired Girl, Old Guy, Cat
Unlock ALL 4 Arcade Games:
Barbie, White Cat, Brown Hair Girl, Brown Cat