Instructions
Open the "Enter Codes" menu from the main menu. Enter "PILOT" to unlock an aviator costume for SpongeBob.
Input "BRAIN" to unlock an exposed-brain costume for SpongeBob. Enter "INVENT" to get an inventor outfit for Plankton. Enter "SAFARI" to get a safari outfit for Patrick.
Input "BONES" to get a skeleton disguise for Patrick and "KRABBY" to get a skeleton disguise for SpongeBob. Select "Active Bonus Item" for to confirm each code you input.