Spiked Ferry

Spiked Ferries are a hazardous version of Flatbed Ferry in Super Mario World 2: Yoshi's Island. They float in place while spikes cover either the top or the bottom of each. They come in green and red, and all of the same color in any given area have their spikes pointing the same way. Nearby, there will always be a Spiked Ferry Block of the same color, which causes all like-colored Spiked Ferries to flip over, inverting their spikes. Usually, red and green versions of both objects appear intermixed in the same area. They first appear in Salvo the Slime's Castle.