Nicktoons Unite! is a 3D person action platformer. Danny Phantom, SpongeBob SquarePants, Timmy Turner and Jimmy Neutron, all known from animated TV series, are brought together to face enemies from their respective worlds.
You can play as any one of the four characters and instantaneously swap at any point in the game. Each character has his own special ability. Danny can wall jump and pass through certain walls. Spongebob can blow bubbles and float in a bubble. Timmy Turner can move quickly and freeze enemies with his special ability. Jimmy Neutron has a gun and a rocket pack.
The game is an action platformer, hosting a standard fare of shootable bad guys, platforms, switches, puzzles and boss fights.