L Block

L Blocks are a variety of green ? Blocks found exclusively in the games Mario & Luigi: Superstar Saga, Mario & Luigi: Partners in Time and Mario & Luigi: Bowser's Inside Story. They are basically the same as ? Blocks, however, only Luigi or Baby Luigi can activate them. M Blocks are similar to these blocks, however, M Blocks can only be activated by Mario or Baby Mario. In Mario & Luigi: Bowser's Inside Story, they are mainly used for mini-games to earn Attack Pieces

L Blocks, along with M & W Blocks, were originally going to appear in Super Mario 64 DS and contained L Caps, but they were removed. The blocks can still be found in the beta test level.