while going inside the mushroom kingdom, you find a strange hallway, you go inside and you fall into the inner castle, you walk around for a while wondering where you are, before coming across a strange bob-omb with a tophat in his lil “shop”, you walk up to him and he greets you “Hey! a new visitor! It's been years since I've seen someone new down here! Welcome to my shop! What would you like?“ awaits your answer, looking quite amused and excited