Jelly fishing gear costume
At the Krusty Krab, body slam the target. A tent will appear and you will have the jelly fishing gear costume.
Mermaid man costume
In downtown (construction site), deliver Krabby Patties to Patrick and he will give it to you.
Reep blower costume
In Jelly Fish Fields, win the 100 jelly fishing contest. Your prize will be the Reep Blower costume.
Reef Blower 2000
To get the reef blower 2000,just get 86 jellyfish
Running on the Hamster Wheel in Tree Dome
Before you jump on the Hamster Wheel, change into your "Fishing Gear" costume. Then, jump on the wheel and keep jumping until the timer reaches zero.