1234
Pretty much any short word relating to SpongeBob such as: happy and sponge.
the pants man
vikings prefer cuddles to fighting
One of the codes is "BUBBLES", another code is "PARTY", there are more, but I don't know them.
all caps: pants
Spongebob Squarepants
My answer is the code is Pants. If you type it in at the main menu you will get an extra life.
Happy
The SpongeBob Jellyfishing Mission Code is: savethejellies
spongebob
i <3 spongebob
click on spongebob