The Binding of Isaac: Rebirth
637 Achievements
800-800h
Steam
A Strange Door
Where could it lead to?
21.5%
How to unlock the A Strange Door achievement in The Binding of Isaac: Rebirth - Definitive Guide
zeusdeegoose
TrueSteamAchievements
TrueSteamAchievements
Complete
. This is done by obtaining Knife Piece 1 and Knife Piece 2 from Downpour/Dross 2 and Mines/Ashpit 2 respectively.
Piece 1: Walk into a White Fire and then into the Mirror. Walking into the White Fire will turn you into The Lost; Holy Mantle within if unlocked beforehand. Go into the Mirror and then into the Treasure Room (Golden Door). From here, return into the regular world by walking into the Mirror again. If you accidentally walk into the White Fire again, simply clear a room and leave to turn back to normal.
Knife Piece 2: There will be a 1x2 room with a Minecart in it. Make note of this. Click the 3 golden buttons scattered across the floor to build the railroad for the minecart. Touch the minecart to enter and explore (and then escape the new area). Assuming you also have Knife Piece 1, the two will unite and turn into a solid damaging familiar.
Clear Mausoleum/Gehena 2 and stab the knife into the door, and then fight the boss within. DO NOT GO TO DEPTHS 2 OR WOMB 2. From here, you'll be in the
floor, and all you need to do is kill
(again).
To enter the strange door, go to Depths 2, kill Mom, take the Polaroid (or negative) and teleport out. Any will do, however a cracked skull is guaranteed to spawn on each floor with a Fool card/Telepills with Lil Baggy. Enter the trapdoor and fight on until you finish the game!
Piece 1: Walk into a White Fire and then into the Mirror. Walking into the White Fire will turn you into The Lost; Holy Mantle within if unlocked beforehand. Go into the Mirror and then into the Treasure Room (Golden Door). From here, return into the regular world by walking into the Mirror again. If you accidentally walk into the White Fire again, simply clear a room and leave to turn back to normal.
Knife Piece 2: There will be a 1x2 room with a Minecart in it. Make note of this. Click the 3 golden buttons scattered across the floor to build the railroad for the minecart. Touch the minecart to enter and explore (and then escape the new area). Assuming you also have Knife Piece 1, the two will unite and turn into a solid damaging familiar.
Clear Mausoleum/Gehena 2 and stab the knife into the door, and then fight the boss within. DO NOT GO TO DEPTHS 2 OR WOMB 2. From here, you'll be in the
To enter the strange door, go to Depths 2, kill Mom, take the Polaroid (or negative) and teleport out. Any will do, however a cracked skull is guaranteed to spawn on each floor with a Fool card/Telepills with Lil Baggy. Enter the trapdoor and fight on until you finish the game!
