Super Mario Advance 2: Super Mario World

Luigi was still persistently leading the way—partially because he knew that if he led the way, he'd have zero-to-none chance of accidentally looking back and seeing Birdo even for just a glimpse.
Behind him, Birdo and Yoshi were following the green plumber quietly, with a grimace on both their faces.
"Looks like this won't be much of an easy thing to do," Yoshi commented.
"What's not easy—finding the clue that just might be here in Yoshi's Island?" Birdo asked.
"No, not that—it's having Luigi reconsider his old thoughts about you," the green dinosaur sighed.
Birdo sighed, too. "You didn't...