One Hundred Cup Challenge As part of our 100 Day celebration we introduced a 100 cup challenge. The children worked in teams of four. The first challenge was to construct a tall tower with 100 paper cups. They had so much fun that they kept building tall and humungous towers for almost the entire week. we gave them a new challenge of building stable structures with marshmallows and toothpicks. Here are a few pictures for you to enjoy.