"Grid measurements..." Billy muttered, staring down at the squares. He pictured the way their colors might change if he moved. Enclosing one square in glowing ones? That was easy. Enclosing five? Not so much. There had to be some trick to it.

Billy thought he knew where to start. He drew a little box in the air with his finger, checking the proposed solution. "Shall I?" he asked his partner.

Just checking! There might be a trap or some other insight to consider.