? Switch Panel
From the Super Mario Wiki
? Switch Panels are objects that are found in Yoshi's Story.
? Switch Panels give more time to a ? Switch Event. To trigger the ? Switch Panel, the Yoshi must shoot a Yoshi Egg at the panel to flip it. There are many of them in certain levels. They also actually act like ? Switches, as if the Yoshi attempts to flip the panel without pressing the ? Switch first, the event will start normally as if he pressed the ? Switch. When the music goes fast-paced, the Yoshi doesn't have much time left in the event unless he flips another ? Switch Panel with another Yoshi Egg.