91-story tree house

Part 7 of the most popular children's series about two restless friends who live in a MULTI-STORY treehouse!
Andy and Terry live in a 91-story treehouse. (It used to be 78 stories, but the boys always have enough ideas for new floors!) Now there is a submarine-shaped sandwich shop that serves sandwiches the size of a real submarine, a control tower, a pinball room where the ball is a man, a wheel of fortune, a huge spider web (with a giant spider!), and a big red button that they hesitate to press because they don't remember what it's for.
It's a good thing there's always something to do in the house, because Andy and Terry had to look after Mr. Nosatenko's grandchildren all day. How many problems will they have this day?