AN: Here is a hint to the puzzle. (:
After what seemed like hours, but was in fact only about ten minutes, Nancy had the red mostly figured out. The turning point had been when she realized that not all the squares had to match the chart. Then it was only a matter of time before she got one red square in the top right, and two in the top left.
"Yes! Success!" she exclaimed in delight when the red circle disappeared. Chuckling drew her attention away. "What?" she asked Scott, who was standing in the doorway.
He kept chuckling. "Nothing, nothing."
That was fine by her. "Green next."