M Block
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A red M Block found in the Mario & Luigi series serves the same function as a ? Block. This type of block can only be activated by Mario and Baby Mario, whereas the similar L Block can only be used by Luigi and Baby Luigi.
M Blocks also appear in Yoshi's Island DS. In this game, Yoshi must be carrying Baby Mario to see them and hit them. Also, some remain invisible even with Baby Mario; these blocks must be hit by Yoshi (with Baby Mario) to appear. The stage Hit the M Blocks! is named after them.