I hear tell that there is a secret HAL room in this game. A room that has the HAL name in star blocks, as well as a set of Copy Essences.
This is supplemented by the ending credits, which includes a screenshot of the room in all its glory. As every other screenshot in the credits sequence is actual game footage, it seems fair to assume this is the case here as well.
Does this room truly exist, and if so, how do I find it?