Ending Room

Ending Room - is an area in B3313.

Description
After all the dark challenges and torment, after the long-awaited defeat of Bowser, Mario and Luigi find themselves in a room that appears to be a small café. The first thing that catches their eye is the large, candle-topped cake. There are several ! blocks on the table nearby, also including a ? block. The room opens to a balcony, where Mario and Luigi finally meet the true Princess Peach...or at least, that's how it appears to the brothers. The only way out of here is to go through the mysterious double doors. The brothers can only go there, because that’s not all...

Origins
This seems to be an original creation.

Upon entering this room, there is a small unique fanfare that sounds reminiscent of this video. Besides this, there is no music in this area.

Talking with Princess Peach:
MY SAVIOUR, YOU DID IT! NOW THAT YOU'VE BEATEN BOWSER,

THE POWER OF THE STARS HAS RETURNED TO THE CASTLE!

TO CELEBRATE, ME AND THE TOADS BAKED YOU A CAKE.

BUT YOU ALREADY KNEW THAT, DIDN'T YOU?

WE WILL PERFORM THE SAME DANCE UNTIL OUR BODIES GROW OLD AND TIRED, AND NOTHING REMAINS ASIDE FROM OUR CADAVRES ON A SCREENPLAY THEY NEVER CHOSE TO PARTICIPATE IN.

YOU CAN ALWAYS PLAY AGAIN.

OR YOU CAN LEAVE.

IT WON'T MAKE A DIFFERENCE.

Leading here

 * Eternal Fort: Defeat Bowser and take the Big Star.

Two-way

 * Monochrome Castle Grounds: Enter the only double doors in the room.