What task did the kids have to accomplish during the third test?

In the third test, the children had to cross a floor filled with blue and black rectangles. This task was designed to assess their ability to think critically and strategically under pressure. Each colored rectangle represented a different rule—such as some being safe to step on while others could lead to failure. This challenge required careful observation, quick decision-making, and teamwork, as they navigated the risky floor while trying to avoid stepping on the wrong squares.

The nature of this task exemplifies the themes of resourcefulness and cooperation that are central to the story. It also reflects the unique characteristics of each child, showcasing their strengths and how they work together to overcome obstacles, which is a recurring motif in "The Mysterious Benedict Society."