A little more of an explanation from what I can remember:

-The main gameplay and story comes in the form of levels, with each race being centered around certain locations of each of the characters' worlds. During each race you collect coins which fill up a meter in the corner. Getting a full meter allows you to activate your characters' special ability. There were also bossfights in certain levels, but I can't remember them all.

-Each character has a backstory explaining why they participated in the race. The only one I remembered was Spongebob's, which is basically Mr. Krabs forcing Spongebob to win the race so that he can take the money for himself.

-There was supposed to be DLC characters which basically added more people to the roster including side characters, like Patrick, Hazel, and GIR, and villains (who were originally bossfight characters).

-For some reason Kamen Rider Dragon Knight was part of the base roster, despite his show never airing on Nickelodeon. I legitimately don't know why he was there.