1-Up Super (also known as a 1-Up DX and 1-Up Deluxe) is an item that appears in every game in the Mario & Luigi series.
Like a normal 1-Up item, 1-Up Supers revive a fallen Bro, but instead, it restores the HP meter to full instead of half. They are generally more expensive and more rare to find in blocks than normal 1-Ups.
In the first two Mario & Luigi games, they are known as 1-Up Supers, but in Mario & Luigi: Bowser's Inside Story, they were renamed to 1-Up Deluxes. They have maintained that name in Mario & Luigi: Dream Team and Mario & Luigi: Paper Jam. In Paper Jam, they are referred to as 1-Up DX. In Mario & Luigi: Superstar Saga + Bowser's Minions, they are once again called 1-Up Supers.