#27.1A Strange DoorA Strange DoorRoom
A Strange Door appears in the starting room of the second floor of Chapter 3.

It contains a trap door leading to a special version of Mausoleum/Gehenna II, ultimately leading to the Ascent path and The Beast fight.

The door requires and will consume either The Polaroid or The Negative.

Given the fact that Mom's Boss Room does not have an exit, Isaac must teleport out upon acquiring one of the items. To accommodate this, a Marked Skull is guaranteed to appear somewhere on the floor, which drops 0 - The Fool when destroyed.

Alternatively, the door can be opened with the Faded Polaroid, Broken Padlock, Cracked Orb, Soul of Cain, or Sharp Key.
Unlock: Defeat Mother.
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