Fists of Foam is a video game, released in 2008 for the LeapFrog Didj and later for LeapFrog Leapster Explorer. In this game Master Udon has captured Sandy and it's up SpongeBob and Patrick to save her. This game is based on the episode "Karate Island."
"Barnacles! Master Udon is up to no good and has squirrel-napped Sandy! Foil this madcap plan by joining forces with martial arts masters SpongeBob and Patrick! Focus all your force to kick, chop and think your way through the hidden dangers all the way to the Ninja Castle."
The game is a side-scrolling game similar to the GBA SpongeBob games. The player takes control of SpongeBob, and Patrick. As the Didj console is made to learn for children, the subject the game focuses on is math. There are times that you'll have to put the right number on the math problems to continue.