The Fairly OddParents!: Shadow Showdown is a 3D platformer game based on the popular cartoon series. When the TV goes out just as the season finale of Crash Nebula starts, Timmy Turner asks his Fairy Godparents for help. When they find their magic is gone, they travel to the Fairy world, where they quickly learn that the Royal jewel is missing and Jorgen von Strangle thinks a recently fired jester is responsible.
The player takes control of Timmy Turner and guides him through various environments, including the Fairy world and his dad's dream world. Gameplay involves mostly platforming and puzzle-solving, with the addition of collecting wish stars to obtain items that help overcome obstacles like pogo sticks, gliders, or jetpacks.