SpongeBob, Patrick, Squidward, and Mr. Krabs are realistic sea creatures hanging out on the Bikini Atoll island. The player can use the mouse to click on a character and move the character around until the player lets go of the mouse. The player can press the left or right arrow keys to move all the characters in that direction. If the player moves a character off the island, they will just come back up onto the island. The player can press the space bar to shake things up (cause an earthquake) on the island. On the island behind the characters are some objects the player can click on.
One of the objects is a bottle with a piece of paper inside and if the player clicks on the bottle, it will show a list of fun things to do in the game. There is a tropical island tree that the player can click on to make coconuts fall from. Sometimes in the game, random objects fall onto the island. The player can click on an object that fell onto the island and drag it to a character to let them interact with it.
On the island behind the characters is a treasure chest. If the player clicks on the treasure chest, it will show the random objects that have been found by the player on the island. Occasionally in the game, seagulls come to attack the characters on the island. This can be prevented by clicking on the seagulls to shoo them away. The player can click the sun or moon in the background to change the time to night or day.
The game never ends until the player chooses to quit the game.
The Halloween update made it possible for Sandy to turn into the Weresquirrel at night.
The Halloween update made it possible for it to rain at night. The rain is white and smoke covers part of the island. Once in a while lightning strikes the characters.
The Halloween update made it possible for the Flying Dutchman to appear at night.
During Halloween, bats would appear at night and behave identical to seagulls.
The Glove Light is seen as one of the random objects in this game. However, the glove light only works when it's nighttime. It has almost no noticeable effect when interacted with during the day as it is almost as bright as the background.
The conch signal is one of the objects seen in the game. If you drag that object to SpongeBob, Patrick, or Sandy they can ask the conch signal a question (similar to the Magic Conch Shell). If you drag the object to SpongeBob he may summon Mermaid Man.
Hans can be seen putting down SpongeBob SquarePants when the player begins the game.