Play as Mr Krabs (BBFB)
Go up to Mr Krabs in Bikini Bottom
Hit him with a Cruise Bubble
Hit him with a Spongebowl
Hit him with a Karate Spin
He will say, "Grrrrr ... Spongebob, go to something else!"
Go behind the Krusty Krab to the dumpster
A message will come up, reading "Throw away money?" Select YES.
Mr Krabs will run to you crying, telling you not the throw the money away. Another message will pop up, asking "Are you sure?" Select NO.
Mr Krabs will be so happy he will help you on your quest.
Mr Krabs has no moves, and he will keep all shiny objects for himself. He also won't go to any other locations, as he won't pay the taxi fee.
Play as Mrs Puff (BBFB)
Go to the Sea Needle
Bungee jump all four bungees three times each. This will unlock a secret area in Kelp Forest.
Go to Kelp Forest and find the secret area.
Once there, fight the Patrick-bot, Sandy-bot, Plankton-bot and Sponge-bot all at once.
If you win, you will win a needle.
Go to Downtown.
Attack Mrs Puff for ten minutes.
She will inflate. Pop her with the needle.
She will bargain with you - if you find the medicine for her, she will help you on your quest.
Go to the Chum Bucket and kill the Spongebot seventy-seven times to win the medicine. You must do this in ten minutes, or Puff will die.
Go back to Mrs Puff in Downtown. Give her the medicine.
Instead of becoming Spongeball, you will become Mrs Puff.