When you beat the final boss of Mines II or Ashpit II, a new door will appear that will only open at the cost of losing two whole hearts. You will have to do all the way back, this time avoiding a few obstacles and traps in which you will have to use bombs or press switches, break locks using keys, etc. So until you return to the original floor, at which point you will recover all the power-ups, objects and statistics that you had. So, you should look for a vertically elongated room with a wagon in which you can get on. From there you will go to a place where at first you will lose all the power-ups and objects that you have caught and where you will see no enemy. After going through several rooms you will get the knife blade, that is, the Knife Piece 2 object, but at that moment the atmosphere will change completely and Mother’s Shadow will appear, who will chase you to kill you.

When you beat the final boss, a door will appear that you can blow to pieces if you carry a couple of bombs , the amount necessary to destroy it. In this way you will come across the entrance to Mines or Ashpit, where once again you will have to go down to its second floor and look for three yellow buttons that will be scattered throughout the area. As you pass over all of them, you will hear a melody and a noise to make it clear that something has been activated. Then you will have to go back the way you came and return to the normal version of the floor. In either case, you will have to go to the second floor of this place until you find a white fire in one of the rooms. As soon as you touch it, your character will leave his body and will transform into The Lost, so you have to be very careful, because in a single hit he will die, unless you have unlocked the Holy Mantle object so that it can withstand one hit per room.Īfter transforming into The Lost you will have to look for a room with a mirror, which will take you to an alternative version of the floor with the rooms placed in reverse. You will simply have to find the object room, where you will find the handle of a knife, also called Knife Piece 1.

How to unlock the lost binding of isaac