Clash with the Anti-World was the last video game released that was based on The Fairly OddParents (not counting the Nicktoons Unite! series). It was released for the Game Boy Advance on September 8, 2006.
Cosmo, Wanda and Timmy Turner set out on a zany new adventure as they are pitted against their nemesis, Mr. Crocker, and evil anti-fairies who have broken into Dimmsdale. On the unluckiest day of the year, Friday the 13th, it's up to Timmy and his Fairy God Parents to use their quick wit and bountiful wishes to defeat the anti-fairies and foil Crocker's plan to take over the world.
Just prior to Friday the 13th, Crocker performs a dastardly experiment that will once and for all prove that fairies exist. But his experiment backfires and turns Timmy's world into the Anti-World where everything is opposite even Timmy and his Fairy Godparents! And now, Anti-Cosmo, Anti-Wanda, and Anti-Timmy are hatching a sinister plan to stop the earth from turning to make it Friday the 13th forever. With their powers slowly dwindling as the dreadful day approaches, the real Timmy and his Fairy Godparents must travel through the Anti-lands and save the rest of the world from the evil Anti-Fairies.