The player plays as one of the six main characters (one of them is inside a robot however). When the player starts the game, they has an option of choosing versus, story, and practice mode. Versus mode is when the player connects to the server and fights with online players (this only works on the Nick.com version). Story mode is when one can fight against all the other characters. Practice mode is when one can do a single fight against any character and choose what location the player wants to brawl in. Once the player starts the fight they use the arrow keys to move. Press the up key to jump. Press Z for special attack and X for super attack once the meter is full. Press the space bar to attack and pick up items.
The player and his/her opponent are trying to knock each other out! The player or his/her opponent will lose a life if the player or his/her opponent is knocked out of the screen or if the player or his/her opponent falls too far. The player has three floating platforms to jump on if necessary. There are also boxes that appear and give the player various power-ups to use against the player's opponent. The game ends when the player or his/her opponent is knocked out and loses all four lives. There are also outfits the player can choose for his/her character.
Glove - Something to attack the opponent. It also makes the character fall slower.
Weight lift - Something to attack the opponent.
Bucket of Chum - Throw on the ground to make players move slower.
The characters have various phrases and words that are either heard or written in speech bubbles during story mode. The dialogue is reused from various SpongeBob episodes. Some have been slightly changed from the original dialogue.
When the game was originally released in July 2014, the character costumes variation were locked. The player would have to play as a certain character for a certain number of times to unlock each one of their costumes. However, by August 2014, this was changed to have all of the characters costumes available instead of having to unlock them.
Early on in the game's life, there was an online Versus mode, but that mode has since been removed.
With the exception of the life counter and the character select screen, Squidward does not have his eyebrows.
For the version of the game on Nickelodeon's U.S. website, SpongeBob's Karate costume is accidentally replaced with Patrick's Barnacle Boy costume, however this error is only visual, and selecting the costume as SpongeBob will not result in you actually selecting Patrick.