Not really a level but a hub, with plenty of golden spatulas when you progress in the game.
In SpongeBob's house at the start of the game, you will need 50 shiny objects to access the closet. To get them, wander round the rooms gathering everything you see. When you have enough, open the closet, get the spatula and go outside. But if you want more to do in SB's little pineapple, go to the 10 shiny objects room, then to the 20. Here you will see SpongeBob's attic. To get a valuable sock, bubble bash the switch on the small tower, hit the one next to it using bubble bounce, then steer the ball which appeared when you hit the first switch to another right next the door. A 25 second countdown will start.
~Get the sock~
Bounce on the trampoline, then go on the platforms to the top where you find the sock. Hey presto!
Here is a list of golden spatulas you can get in Bikini Bottom and what top do to get them.
On Top of the Pineapple: Bubble bash the floating switch to the right of Squidward's house. A timer should start. Next, hit the switch next to Patrick's. Jump on the floating platform and let it lead you across to Squidward's roof. Here you will find a pair of golder underwear which will let you have four lives instead of just the three. Jump across to SpongeBob's house (using the platforms of course) and get the spatula.
Annoy Squidward: Easy. Go into Squidward's house, talk to him, and jump around. He will eventually get so mad he will give you a golden spatula. If you break everything there, you also get a sock.
On top of Shady Shoals: Once you beat Robo-Sandy, stand on the footpad outside the police station and bubble bowl the switch. Jump on the trampoline and land on the police station. Inside the funnel you will find another pair of gold undies- however, this sacrifices a lot of time and is not recommended for people who are new to this.
On top of the Chum Bucket- Once you have the guided cruise bubble, walk to the right side of the Chum Bucket. There you will see three buttons which you must press in order to activate a trampoline. Bounce on it and land on top of the Chum Bucket to claim your prize! Note: If you land on the Krusty Krab's sign instead, you can grab a pair of golden undies.
Ambush at the Tree Dome: When you first enter the tree dome, you must get rid of all the robots there. There isn't much of a tactic you can use here, and you are timed, so be careful.
Infestation at the Krusty Krab: Much like at the tree dome, you have to get rid of all the Krusty Krab's robots. Thankfully, there is no time limit. My tip is to get rid of the major robots first (eg Sleepy Time) then destroy the Duplicatotron 1000s. Annoyingly, Mr Krabs won't trade shiny objects for golden spatulas until you complete the challenge.
A Wall Jump at the Bucket: Inside the Chum Bucket there is a giant pipe next to the kitchen door. Stand on the pipe (the bit which goes into the wall) and use the gap between the wall and the pipe as a wall jump. Note: Sorry, that was a bad example.
At the start of the game only some parts can be reached, but they can be unlocked by getting golden spatulas and defeating bosses.
This is a list of all the socks available in Bikini Bottom and where they are found.
#1- In SpongeBob's attic (see above).
#2- In Patrick's house, hit the sofa and a sock will appear above it.
#3- Next to Patrick (come on, as if you could miss that one!)
#4- In Squidward's house (see above).
#5- Found by hitting the water fountain next to Shady Shoals.
#6- While inside Shady Shoals, hit the TV.
#7- Whack the dumpster at the Krusty Krab.
#8- Destroy everything at the Krusty Krab (use bubble bounce to squash the condiments).