have to be high rank ,high level,and hp and sp have to be fully recharged. you have to have all of the speical attacks (if you havent got the all attack pieces in the energy hold your out of luck) all of the badges that you can get and alot of 1-ups/1-up deluxes max mushrooms or any kind of mushrooms and if you get the bye bye gloves from one of the towers in peaches castle you can free luigi from the junker can with one perfect hit of a hammer. you have any question post them in the commets of this secret and i might check it withen 1-4 days depending on my scheedual.