A Yoshi Block (ヨッシーブロック Yosshī Burokku?, Yoshi Block) is a block which appears in Super Mario World 2: Yoshi's Island and Yoshi's Island DS.
Description[]
They are orange blocks adorned with the face of a Yoshi, the color of which is the same as the current Yoshi being played. Yoshi Blocks are found at the end of a section that needs to be traversed with the help of the transformation caused by a Morph Bubble. Touching a Yoshi Block returns the Yoshi to his normal form, allowing him to continue on his way. If the Yoshi does not reach the Yoshi Block before the transformation expires, he is sent back to the Morph Bubble and must attempt to reach it again.