In "Episode 099: The Secret Passage," listeners experience an exciting adventure with Benjamin Blümchen and his friends. When Little Känga falls into a secret underground passage while playing hide and seek at the zoo, the excitement is palpable. Karla Kolumna doesn't hesitate and climbs in after her to help the little kangaroo. But suddenly, the way back is blocked by falling stones. While Benjamin and Otto desperately try to free their friend, they must find another exit from the passage. This captivating story not only provides entertainment but also stimulates the imagination and fosters problem-solving skills in young listeners.