SpongeBob's sand castle
Description
Small
It is a sand castle with five windows and two floors.
Average-Sized
This version of the sand castle has three layers and 6 windows, with a staircase surrounding the middle. It was walled-in during the episode, although the wall itself wasn't completely finished.
Big
The big version is a cube-shaped castle with battlements on top. It has a brick texture all over it, two gargoyles sitting on the sides of the front, and a door.
Role in episode
It serves as SpongeBob sand castle throughout the episode. He makes a small version of the sand castle at first, but since he "ruined" Patrick's sand castle, Patrick destroys his sand castle. SpongeBob makes a bigger castle, and also walls it in to protect it from Patrick, but because SpongeBob cut Patrick's castle to not go across the line, Patrick smashes SpongeBob's sand castle with a hammer. SpongeBob then decides to make a huge sand castle, with many features. This sand castle would remain intact until the end of the episode, where it is destroyed by Patrick using the helmet of his sand robot.
Role in online game
It is the thing you protect against enemies in the online game. If it gets hit too many times, the player loses.