From WiKirby, your independent source of Kirby knowledge.
Jam Jungle is the fourth level of Kirby: Squeak Squad, featuring heavy vegetation and ruins. It also features a mechanical stage that looks remarkably similar to the interior of the Halberd. Its boss is Yadogaine, controlled by Doc.
Each stage is unlocked in succession after clearing the previous one. Defeating Yadogaine is necessary to move on to Vocal Volcano. For more information about a particular stage, click on the link to the stage's page in the table.