Black Market

Black Markets are unique shops that can be accessed through a Crawl Space. Black Markets are 2 rooms wide. The left side of the Black Market contains a door back to the crawlspace and a trapdoor or beam of light to the next floor (including the Dark Room or Chest, even if they haven't been unlocked yet). The center of the room contains several items from the Shop pool that can all be bought for 1 Red Heart container. Although these will not be Devil Room items, they still count as Devil deals for Angel Room generation and unlocking Azazel. This is no longer the case, and Isaac can buy items from the Black Market without affecting the spawn chances of Angel rooms. The rest of the room will be strewn about with shopkeepers, pickups, and various beggars and machines.

Starting in patch version 1.03, Telepills and Undefined have a very small chance to teleport you to the Black Market, but there will be no door leading to a Crawl Space. This means that the player will be forced to take the trapdoor/beam of light if they don't have any item to teleport again, like in an I AM ERROR Room.

Bug!

In the current version of the Repentance DLC, Black Markets are nearly impossible to enter: leaving a crawlspace via any method (other than going back the way you came), intended or glitchy, will redirect the player to I AM ERROR room instead, even in levels where I AM ERROR rooms are specifically disallowed. The only exception is the right side of Great Gideon's grave, which can be glitched through.

Variations

The following room maps were made using Basement Renovator for cleaner viewing; note that all Urns you see will be Skulls when encountered in-game. Additionally, the door to the crawlspace will close if there are enemies in the room, but the trapdoor will always be open.

ID	Weight	Contents	Image preview
1	1.0	Five items for sale, a shopkeeper, four skulls, a key master, and a devil beggar.
2	1.0	Four items for sale, three shopkeepers, two skulls, four blue fireplaces (two of which can be reached), a beggar, and a key master.
3	1.0	Two hearts, five items for sale, two shopkeepers, two coins, and a donation machine.
4	1.0	Greed, five items for sale, two shopkeepers, a beggar, and a devil beggar.
5	1.0	Five items for sale, three shopkeepers, and two buttons.
6	1.0	Five items for sale, four shopkeepers, two trinkets, and three black flies. There are also two trapdoors on the left side of the room instead of one.
7	1.0	Five items for sale, three shopkeepers, a restock machine, and a black/white pill.
8	0.1	Two items and three pills for sale, three shopkeepers (two of which will be special), four skulls, a restock machine, and a bed.
9	0.1	An item for sale, five shopkeepers, four skulls, three black flies, a poop, and a red chest.

Notes

• Exiting the Black Market through the beam of light in Chest or Dark Room causes the floor to restart (in a similar fashion to Forget Me Now), as there are no floors further than these two. This can come in handy to gather a lot of items. The same applies to I AM ERROR.
  • Black Markets and I AM ERROR can no longer be accessed in The Chest or Dark Room.
• Black Markets and I AM ERROR can be found in The Void. Using the trapdoor causes the floor to restart (in a similar fashion to Forget Me Now).
  • Players can no longer access the Black Market through the wall glitch. However, it is still possible to access the Black Market using the glitch via special circumstances including having Ipecac and The Inner Eye.
• The Lost can take items from the Black Market for free, just like with regular devil deals.
  • The Lost can take only one item from each selection of items. When an item is taken, the others disappear.
  • If a Black Market is found in the Mirrored World and is populated using a Restock Machine, it will follow the rules of the non-mirrored character. Despite playing as The Lost in this area, multiple items can be purchased, and health will be deducted from the non-mirrored character, possibly resulting in death.
• When playing as Keeper, the items are sold for money instead, making it no different from a regular Shop.
• When two crawl spaces lead to a Black Market in the same floor, they lead to the same Black Market
• During the Ascent, crawlspaces with Black Markets lead to an I AM ERROR room instead

Gallery

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Bugs

Bug!	Creating and entering a trapdoor which also leads to a Black Market (for example by We Need to Go Deeper! or an Rune of Ehwaz rune) results in not being able to escape the Black Market other than going to the next floor.

Bug!	Using Telepills or Undefined to enter a black market in the mirrored world on Downpour II and Dross II will generate a black market with no items and no exits. Without any other means of teleporting, this will softlock a run.

Seeds

PC ZH2A NT12 (The Cellar II, large room on the top left of the map, Tinted Rock on the middle-right side of the room)

PC ZJTC L4DS (First floor 1 room to the right, Rock in the middle of the room)

PC S3B9 KPMG (Bedroom adjacent to spawn, Treasure Room adjacent to spawn contains Pyro)

PC RS1V ZOLD (For Greed mode, the Rock on the top left of the Shop on the first floor, and there is also a Match Book in Silver Treasure Room which gives you Bombs to break it)

PC 3PKW XC9M (Right before boss room by the tinted rock)