If you eant to cheat, then do the following! Enter the main menu, then, select the “Extras” option, next, go to the “Enter Codes” selection and type one of the following codes. Finally, choose the “Activate Bonus Items” option you will find under the “Extras” menu and activate the cheat codes!
30,000 Z: enter “ROCFISH” as a code.
Bonus vehicle in Diesel Dreaming level: enter e “HOTROD” as a code and you will unlock the bonus vehicle.
Bonus ship in Rocket Rodeo level: enter “SPACE” as a code to get a bonus ship.
Alternate Plankton hovercraft: enter “HOVER” as a code.
Alternate rocket for Patrick in Hypnotic Highway level: enter “ROCKET” as a code.
Alternate laser color in Revenge Of The Giant Plankton level: enter “LASER” as a code.