Hold R and press Start, Select, L, Select, Start at the main menu. The phrase ''Oh joy'' will be spoken to confirm correct code entry. All hidden characters, tracks, cups, and difficulty settings will be unlocked.

Play as Plankton:-  Win Cup 3 under the medium difficulty setting.

Bonus tracks:-  Win Cup 1 under the easy difficulty setting in cups mode to unlock the Race Madness, Bikini Bottom Blowout, Safari Speedway, and Bever Fever tracks in cups mode. Win Cup 1 under the hard difficulty setting to unlock the same tracks in time trial mode.

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

Code Effect - Hold R, press Start, Select, L, Select, Start (on main menu) All Cheats (secret character, all tracks, all cups, all difficulties)

Unlockables - Extra Tracks

Bever Fever, Bikini Bottom Blowout, Race Madness, Safari Speedway (Cups Mode) Win Cup 1 (Easy)
Bever Fever, Bikini Bottom Blowout, Race Madness, Safari Speedway (Time Trial Mode) Win Cup 1 (Hard)
Congo Bongo Bang Up, Gritty City Circuit, Nearburg Rally, Pickles Parkway (Cups Mode) Win Cup 2 (Easy)
Congo Bongo Bang Up, Gritty City Circuit, Nearburg Rally, Pickles Parkway (Time Trial Mode) Win Cup 2 (Hard)

Unlockable Character - Plankton Win Cup 3 (Medium)

Gameshark Codes

Must Be On [M] 8FB1BB69C11AF213  F6D43CAEDFBF4292
Start On Last Lap 0F954C0ED4745D08
Infinite Retries 3142CBD959788336