Devil Room

This article is about the room. For the item pool, see Devil Room (Item Pool).

**Devil Rooms** primarily allow Isaac to make Deals with the Devil, but they can also contain a variety of enemies, pickups, or even a boss battle against Krampus. A **Devil Room** has a chance to appear in a Boss Room after the boss occupying it has been defeated. If certain criteria are met, a Devil Room can be replaced by an Angel Room.

 In Greed Mode, Devil Rooms are guaranteed to appear upon completing the optional 11th wave of a floor.

## Possible Contents

* 1-3 Deals with the Devil
* 3 Red Chests
* 2 Black Hearts
* Krampus
* 1 Angel Statue
* 2 Deals with the Devil and 1 Devil Beggar
* 4 Deals with the Devil
* 5 Red Chests
* 3 Devil Beggars
* 2 Deals with the Devil and 1 Black Sack
* 2 Runes

Additionally, 2 Red Fire Places may spawn,  as well as Urns. Spikes may spawn instead of or in addition to any items/pickups.
Some regular enemies can appear as well, including:
 1 Mom's Hand, 2 Nulls, 1 Imp, or  1 Mom's Dead Hand.

* If Isaac is holding : 2 Begottens, 3 Nulls, 2 Imps, 1 Evil Twin, 1 Black Maw, 3 Black Globin's Heads, 3 Wizoobs, 4 Soul Suckers, or 1 Bloodshot Eye may spawn.

If a Devil Room appears upon defeating Mom's Heart  or It Lives, it will only contain a trapdoor to Sheol.

## Deals with the Devil

A Devil Room has a high chance of spawning items that will be put up for sale. Unlike Shops, where Isaac pays with money, to make Deals with the Devil Isaac has to trade Red Heart Containers as payment. All items normally cost either 1 or 2 Red Heart Containers, and their prices roughly correspond to their power.

When playing as Keeper, the character's coin heart containers are used to trade for Devil Deal items, with items costing the same number of coin heart containers as red heart containers with a different character.

* Instead of coin heart containers, Devil Deal items must be bought using coins. One-heart and two-heart deals cost 15 and 30 cents, respectively. Paying cents for Devil Deals will still remove the Angel room appearance chance in the same way when other characters pay with heart containers.

*See the following item pool for a comprehensive list of items offered and their health price:* Devil Room (Item Pool)

### Notes

* If Isaac does not have Red Heart Containers upon entering a Devil Room, all items will cost 3 Soul Hearts.
	+ If Isaac is presented with 2+ items to buy, but only has enough Red Hearts to buy one, the price of the other(s) will change to 3 Soul Hearts upon spending your Red Hearts.
	+ Additionally, if Isaac only has one Red Heart, deals that normally cost 2 Hearts will change to one Red Heart and two Soul Hearts.
		- If Isaac does not have enough Soul Hearts for this type, he will still be able to take the Deal.
	+ If Isaac has less than 3 Soul Hearts, but at least one Bone Heart, he can take a three-Soul-Heart Deal and stay alive because of the bone hearts.
* Two-heart deals can be taken even if Isaac does not have enough Red Hearts to afford them, as long as he has one Red Heart to spend.
* Spending all of his Heart Containers will not kill Isaac as long as he has Soul Hearts, Black Hearts, or  Bone Hearts remaining.
	+ If taking a Deal leaves Isaac with no health remaining, he can still survive if he picks up a Soul Heart, Black Heart, or Bone Heart while holding the item in the air. Also, if he has an active item that grants Soul/Black Hearts, he can take a Deal and then use the active item, leaving him alive with whatever the item gave him.
		- If Isaac takes a Deal for an item that grants an Eternal Heart through the use of , it will *not* keep him alive.
* The temporary heart container granted by XI - Strength or cannot be used to purchase a devil deal. However, if Isaac has no other heart containers to spend, then it can be used this way. This also works if the devil deal costs 2 hearts, but Isaac only has 1 before activating the Strength card.
	+ III - The Empress? also works this way.
* Some items may cost Soul Hearts even if Isaac still has Red Hearts.
	+ An item's price may change from Red Hearts to Soul Hearts if Isaac visits the Devil Room before obtaining enough Soul Hearts and returning to the Devil Room.

### Angel Rooms

* Refusing to make Deals with the Devil will give Isaac the chance of an Angel Room replacing the **Devil Room** on subsequent floors. If any Deal with the Devil is taken, Angel Rooms will not spawn for the remainder of the run.
	+ Trading Heart Containers for items in a Black Market counts as taking a Deal with the Devil for Angel Room generation purposes.
* Only the act of paying health (Red Hearts or Soul Hearts) for an item in a Devil Room counts as a Deal with the Devil. Taking Black Hearts, opening Red Chests, and taking items that weren't paid for (such as those obtained from Red Chests, Krampus, Beggars, , or made free by using ) do not count as Deals taken, allowing Isaac to still see Angel Rooms.
* If the first offered Devil Room is not entered at all, the next offer is guaranteed to be an Angel Room. If the player uses the  it will take you to the Angel Room without removing the guarantee.

## Conditions to Make Devil Rooms Appear

A **Devil Room** can only open on floors between the second floor of Chapter 1 and Chapter 4.

There is only a 1% base chance for the Devil Room door to open. This chance can be modified in various ways:

For example, if Isaac has avoided taking Red Heart damage and has blown up a Shopkeeper, he will have a (1+35+99+10)% = 145% base Deal with the Devil chance which will be displayed 100%, which will then go down to 36.25% once he sees the Devil Room.

## Notes

* If the player enters a Devil Room without the entrance door appearing (by teleporting in), the chance to receive a Devil Room will not be reduced. Because of this, if a Devil Room is seen this way and the player does not want to enter it again, intentionally taking red heart damage will reduce the chance of seeing it after the boss fight, which can prevent the penalty from seeing the Devil Room door from applying to the next floor.
* The chance that the Devil Room or Angel Room door will remain open after re-entering the Boss Room is based on the current Deal with the Devil chance, which gains the x0.25 multiplier from seeing the Devil Room door less than two floors ago. Due to its high chance of disappearing, it is recommended to go directly into the Devil Room when offered,  unless it's the first time one is seen and the player wants to get a guaranteed Angel deal.
	+ Once a Devil Room door closes for the floor, it cannot be re-opened without picking up .
* On XL floors, the Devil Room door can only appear after completing the second Boss Room.
* On XL floors, not seeing a Devil Room will count as not seeing a Devil Room for two floors.
* Taking Soul Heart, Black Heart, Eternal Heart,  Bone Heart, or  Rotten Heart damage does not decrease the chance to open a Devil Room; only Red Hearts count.
	+ Taking red heart damage from a Devil Beggar, Blood Donation Machine, , , , or  does not decrease the chance to open a Devil Room.
		- The Bad Trip pill effect or damage from Curse Room doors still counts as Red Heart damage.
		- Losing a Bone Heart container as  The Forgotten counts as Red Heart damage.
			* This includes losing a Bone Heart through self-damage.
	+ Tainted Magdalene's leaking Red Hearts being damaged does not count as Red Heart damage, regardless of the damage source.
* Killing Devil Beggars, Shell Game Beggars, or Key Masters does not increase the chance of opening the Devil Room.
* There are additional ways to enter a Devil Room on any floor:
	+ Red Chests have a chance of teleporting Isaac into the Devil Room upon being opened.
	+ Using  will teleport Isaac into the room.
	+ Using  after all other rooms on the floor (excluding the I AM ERROR room) have been visited.
* , , and Telepills cannot transport Isaac to the Devil Room.
* The Lost can take all Deals with the Devil for free.
* If a deal would deal lethal damage to  The Soul, quickly switching to  The Forgotten will keep him alive. This can even be done to take 3-heart deals for one soul heart.
	+ If The Soul has no Hearts, switching to The Soul is disabled until another Soul or Black Heart is acquired.
* The Lost,  Tainted Lost, and  Tainted Jacob in ghost form are allowed to take one of the offered Deals for free; the others will vanish afterward.
* ??? pays for Devil Deals with Soul Hearts for prices equal to their Red heart equivalent; ie, one or two Soul Hearts depending on the item, rather than the normal three. No other character has this effect, including  Tainted ???.
* The rock behind the Devil can rarely be a Tinted Rock.
* An Angel statue can rarely substitute the Satan statue and can be awoken with an explosion as usual.
	+ Angels spawned in this way do not drop Key Pieces, however.
* The highest possible Devil Room chance without Goat Head is 204% in *Afterbirth*, or 254% in *Repentance*.

## Unlockable Achievements

* Azazel - Make 3 **Deals with the Devil** in one run.

* Krampus - Take 20 **items from Devil Rooms**.

* Death's List - Take 25 **Deals with the Devil**.

* Sacrificial Altar - Take 50 **Deals with the Devil**.

## Trivia

* In the original *The Binding of Isaac*, the Devil Rooms were somewhat less forgiving; if Isaac had an Eternal Heart, taking a Devil Deal would remove it.
	+ Furthermore, if Isaac has at least one Soul Heart and one Red Heart Container, and he takes a Devil Deal, Isaac would die. Isaac's last will will show a pentagram or a goat head as a result.
	+ Purchasing something worth two Red Heart Containers with one Red Heart Container and at least one Soul Heart will also remove the Soul Heart. Strangely, this will not kill Isaac, but the next hit he takes will, similar to  The Lost.

## References

1. ↑ https://www.youtube.com/watch?v=EEdBTgyKxqU