Nicktoons Racing Cheats

Using cheat mode:
Press and hold R and push Start, Select, L, Select, Start in the main menu. You will hear the words OH JOY if you have entered the code correctly. All hidden characters, tracks, cups, and difficultys will be unlocked.
 

Unlock Plankton:
By winning Cup 3 under medium difficulty.
 

How to get bonus tracks:
By winning Cup 1 under easy difficulty in cups mode to unlock the Race Madness, Bikini Bottom Blowout, Safari Speedway, and Bever Fever tracks in cups mode. Win Cup 1 under hard difficulty to unlock the same tracks in time trial mode.

By winning Cup 2 under easy difficulty in cups mode to unlock the Nearburg Rally, Gritty City Circuit, Pickles Parkway, and Congo Bongo Bang Up tracks in cups mode. By winning Cup 2 under hard difficulty to unlock the same tracks in time trial mode.