The Dueling Knight's Fungeon Dungeon

From the introduction: The Dueling Knight's Fungeon Dungeon is intended for four characters with an average party level (APL) of 2. Characters who complete this adventure should earn enough experience to reach 3rd-level. The characters must head down into the belly of a magical dungeon and fix it before it explodes destroying the city. This campaign takes place in Arden, although it can be set in your own world. Any party composition should be able to finish the adventure with intelligent play.