Choose "extras" from the main menu, then select "Cheat Codes" and enter the following password:

TISSUE

Choose "extras" from the main menu, then select "Cheat Codes" and enter the following password:

ROCFISH

Go to the extras menu and select cheat codes
from there put in the code FLAMES this inables spongebob's car flame effect color in Diesel Dreaming

Go to the extras menu and select cheat codes
and put in the code HYPCAR this inables spongebob's hypnotic car skin in Hypnotic Highway

Go to the extras menu and select cheat codes
and put in the code DUCKGUN this inables spongebob's squeaky duck gun in It Came From Bikini Bottom

Choose "extras" from the main menu, then select "Cheat Codes" and enter the following password:

GASSY

Choose "extras" from the main menu, then select "Cheat Codes" and enter the following password:

VIGOR

Choose "extras" from the main menu, then select "Cheat Codes" and enter the following password:

EMCSQR

Input the passwords under "Enter Codes" section, then select "Active Bonus Item" to confirm the cheats.

HOTROD - Unlock a bonus vehicle in the Diesel Dreaming level.
HOVER - Alternate Plankton hovercraft.
LASER - Extra laser color in Revenge Of The Giant Plankton level.
ROCKET - Extra rocket for Patrick in Hypnotic Highway level.
SPONGE - Play as Punk SpongeBob in Diesel Dreaming level.
PIRATE - Play as Pirate Patrick in Rooftop Rumble level.
SPACE - Unlock bonus ship in the Rocket Rodeo level.
PANTS - Play as SpongeBob Plankton in Super-Size Patty level.

Go to the extras menu and select Cheat Codes
and put in the code "safari" (qoutes are not needed) this inables Patrick's safari costume in
Rocket Rodeo

KRABBY- Spongebob gets a cool suit in the alasken bull worm level

Choose "extras" from the main menu, then select "Cheat Codes" and enter the following password:

GUDGEON

Choose "extras" from the main menu, then select "Cheat Codes" and enter the following password:

PORKPIE