Get the Shark Costume from Joe, then go right into the break room. There are some Biologists here. Afterwards, go to every Biologist in the large room that leads into the cafeteria.
In the "World of Kelp" level. stop the Kelps that your sons shoot at you with an otter figure. After that mini-game ends, pick up the otter's head and put it on your head.
At the start of the last chapter, "Hot Concessions", allow the game to idle until you die one hundred times.
Get the captain's uniform, then return to the ship and approach every sailor. Make sure they talk to you and not with each other. You also have to talk to the sailor who you stole the coffee from after going back over the beam crane.
Play "Deep Dark Sea". After you get the shake light, Stacy will ask for it when you find the biologist. Before giving her the shake light, continue walking ahead to find the jellyfish collection.
Play under the easy difficulty setting in order to have no consequences if you get seen by Biologists. After leaving the Gift Shop, enter the Ladies toilet. Go through the gutter into the break room, start the fire, the exit through the Men's toilet and walk through the turnstile. Do not take Joe's Shark Costume. Just go to the Cafeteria and enter it through the service hatch.
Throw the birdhouse back onto the hook. Simply placing it there will not work.
After escaping the Chef in the "Supermarket" level, take a lemon from the fruit department and scan it at the checkout.
Successfully complete the game.
You can find a display for the "Mintcraft" game inside the grocery store.