From the Super Mario Wiki, the Mario encyclopedia
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M Blocks, also known as Mario Blocks, are blocks found in the Mario & Luigi series and they serve as 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. They may contain items for the Mario Bros. to collect.
M Blocks also appear in Yoshi's Island DS. In this game, a 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.
A similar block known as "Cap Block M", along with Cap Blocks L and W, were originally going to appear in Super Mario 64 DS and contained Mario's Caps, but they were removed. The blocks can still be found in a test level.
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