As a part of the Rani Task, the entire Bigg Boss 13 house was turned into a kingdom where Bigg Boss is the king and the ladies of the house are his queens. All the queens are locked up in a dungeon near the garden area surrounded by pots with names of each queen written on it. 

Kaun banegi #BiggBoss13 ki pehli queen? #BB13 @BeingSalmanKhan @Vivo_India

— COLORS (@ColorsTV) October 8, 2019

The boys of the house are the guards and at the sound of a drumroll, they have to aim to grab the key hung in the garden area. Whoever reaches first gets the chance to open the gate and can pull out a queen from the dungeon. While doing so, the queen has to pick a pot of her opponent, who she thinks is not suited to be the queen and throw it in the pool giving a valid reason for her decision.