L Block

L Blocks are a variety of green ? Blocks found exclusively in the games Mario & Luigi: Superstar Saga and Mario & Luigi: Partners in Time. 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.

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.  They also apeared in Mario & Luigi: Bowsers inside story later in the game used for mainly mini games to get Atack pieces