Hey Arnold!: The Movie is a platform video game developed by Altron and published by THQ, based on the movie of the same name. The game consists of five worlds holding four levels in each and one boss. Players may control Arnold, Gerald, Grandpa, and Grandma, which all are assigned their own levels with their own objectives. Helga, who can be unlocked with a secret code, replaces all the other characters. Using the same code will revert them back.