Timmy Turner's parents have gone on a vacation and left Timmy with evil babysitter Vicky. When Timmy tries to make a wish, his fairy godparents Cosmo and Wanda tell him that it's against "Da Rules". Outraged, Timmy wishes he didn't have to follow the rules, leading Cosmo to destroy the book. When Vicky arrives, she gains possession of Da Rules. She wishes that Timmy was still sleeping, and since she has possession of a fairy item, her wish is granted. Timmy, Cosmo, and Wanda go to Fairy Court, where they're accused of destroying Da Rules, and Jorgen gives the three of them 49½ hours to find the book's missing pages. Timmy must navigate through ten levels and find the pages before Vicky's wishing goes too far. By the end of the game, everything is back to normal and Da Rules has all of its pages back.
The PC version features a different plot. In this version, Juandissimo Magnifico tricks Timmy into wishing the book destroyed so that Cosmo and Wanda will get in trouble for it. It also notably features an appearance by Vicky and Tootie[broken anchor]'s mother (at Timmy's age, as the level featuring her is set in the past), named Nicky. She is shown behaving a lot like Tootie, and Timmy initially mistakes her for Tootie when he first sees her, although the in-game graphics depict her as resembling a young Vicky.
In the Game Boy Advance version, Anti-Cosmo and Anti-Wanda steal the book, and use Vicky's dreams as a conduit for their magic. As punishment, Cosmo and Wanda are demoted to 3rd-Class Fairies. In response, they arm Timmy with an anti-magic backpack and magic cannon. Eventually, the Anti-Fairies are defeated and Cosmo and Wanda wake Vicky, restoring peace and convincing Jorgen to promote them back to 1st-Class Fairies.
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Breakin' da Rules received mixed to positive reviews. IGN gave this game 5.0/10. The GameRankings aggregate score was highest for the PlayStation 2 version (73%); the others were slightly negative, as far down as 40% on the PC.