I stand by my comment that you only need one whistle. If you use more than that, you miss the worlds that are actually fun!! Water land, ice land, and giant land are fun. I can skip the one in the clouds. I can’t remember the order but I would almost always skip World 2 unless one of my brothers insisted.
The original artist was planning to but was found floating in Lake Michigan shortly after the publication. His girlfriend went to visit her family in the English countryside and hasn’t been heard from since. His brother was killed in a freak industrial accident. His mother denies she ever had a son. Seems like someone was getting too close to the truth.