Sacrifice Room

Sacrifice Rooms are special rooms that contain a set of spikes in their center. Isaac can damage himself on the spikes for a chance to spawn a brown chest or a golden chest. The chance is determined by the seed, meaning Isaac must damage himself on the spikes a set number of times for a chest.

The chances for the generation of either a Dice or Sacrifice Room: (1/7 (~14%) base chance, plus an independent 1/4 chance for a total of 5/14 (~36%) if Isaac’s total health is equal to or greater than his total Heart Containers) Has a 1/50 base chance to be a Dice Room, plus an independent 1/5 chance for a total of 27/125 (~22%) if Isaac has 2 or more keys; otherwise a Sacrifice Room is chosen.

Sacrifice Rooms were reworked, with a wide variety of possible rewards.

Rewards

The payouts only depend on the number of sacrifices made. The number of sacrifices is reset to 0 when the player goes to the next floor.

№ of sacrifices on Current Floor	Chance	Reward
1st / 2nd	50%	Nothing
	50%	1 Penny
	100%	1 Bomb (Only if the first floor boss has been defeated in less than one minute and the player has no bombs, to help obtain Broken Shovel)
3rd	33%	Nothing
	67%	"You feel blessed!" (increased chance to receive an Angel Room over a Devil Room for the current floor) Does not increase the chance of a Devil/Angel room after defeating a boss, only the chance of getting an Angel Room over a Devil Room. Can cause an Angel Room to spawn even if the player has already taken a deal with the Devil. Less of a modifier than the "You feel blessed!" effect below. A guaranteed Angel Room replacement if this occurred in a Chapter 1 XL floor.
4th	50%	Nothing
	50%	1 random chest (The type of chest is governed by the same mechanic as room drops. Thus, brown chests are more likely to spawn than any other kind of chest.)
5th	33%	3 Pennies (These coins do not have a chance to spawn as a nickel or a dime.)
	67%	"You feel blessed!" (Same conditions as 3rd sacrifice but providing a stronger modifier.)
6th	33%	Teleport to the Devil/Angel Room. (If the floor's Devil/Angel Room has not been spawned yet, an Angel Room is guaranteed to spawn — even if a Devil Deal has already been taken.)
	67%	1 random chest (The type of chest is governed by the same mechanic as room drops. Thus, brown chests are more likely to spawn than any other kind of chest.)
7th	33%	1 random Angel Room pedestal item. If Isaac has taken a Devil Deal this run, while in chapter 1-3, Redemption will be spawned instead if it has been unlocked. Chapter 3.5 and later spawn 1 Angel item as normal.
	67%	1 Soul Heart
8th	100%	6 Troll Bombs
9th	100%	Uriel battle
10th	50%	7 Soul Hearts
	50%	30 Pennies
11th	100%	Gabriel battle
12th and onwards	50%	Nothing
	50%	Teleport directly to the Dark Room.

Layouts

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  (Rare)

Notes

• The sacrifice rewards are determined ahead of time, not when the player steps on the spikes.
  • Received items/trinkets can be changed, however. If the player checks the items and resets (such as with the ), they can find that item on the same level, then redo the sacrifice to force an item reroll.
  • Resetting will reset your number of sacrifices to what it was prior to your reset unless stated otherwise.
• Spikes in a Sacrifice Room cannot be flown over, so Isaac can use them even with Flight.
• Invincibility and shields will not trigger a sacrifice (including Holy Mantle).
• The Callus prevents the Sacrifice Room from functioning.
• Sacrifice Rooms do not appear in the The Chest or Dark Room.
• Sacrifice Room spikes won't teleport Isaac to the Dark Room when on a challenge or daily run that does not end there, thus nothing will happen from the 12th sacrifice onward.
• If more than one Sacrifice Room is created in one level with Red Key or equivalent effects, each Sacrifice Room has its own sacrifice counter. For example, doing 3 sacrifices in one room, then 3 in another gives you the 1st to 3rd effects from both rooms, instead of 1st to 3rd, then 4th to 6th. Additionally, performing more sacrifices in the first room again will count up from 4th; the count is not reset by using another room.
• Sacrifice Rooms generated by using Red Key in the Dark Room will, when used enough times, teleport the player to a new instance of the Dark Room. This effectively re-rolls the floor.
• Entering a Sacrifice Room while holding Flat File will remove the spikes. Dropping the trinket and re-entering the room will cause the spikes to reappear.

Notes on Rebirth Sacrifice Rooms (non-revamped)

• Only one chest can be received per Sacrifice Room.
• Taking damage down to half a red heart will always drop a chest. (Because ??? has no red health, dropping down to half a heart does not guarantee a drop.)
• Dying on the spikes guarantees a chest, which can be useful if Isaac is low on health and has more lives from something like the Dead Cat.
• Dying in a sacrifice room with the Missing Poster will reveal puzzle pieces used to unlock the The Lost.

Notes on Afterbirth Sacrifice Rooms (revamped)

• If a player receives both of the "You feel blessed!" effects, they will stack for a 65% Angel Room Generation Chance.
• The amount of health the player has left after taking a sacrifice does not affect the payout probabilities.
• Losing red hearts due to the spikes will reduce the chance for a Devil Room to appear.
• The player's Luck stat does not affect the payout probabilities.
• If Uriel or Gabriel spawn, they can be despawned by exiting and reentering the room. However, they will not drop the Key Pieces unless defeated.
  • Angels drop nothing if the player already has their corresponding Key Piece.
• Angels can normally fly over spikes, but they take damage from Sacrifice Room spikes.
• Dying in a Sacrifice Room while holding Missing Poster will unlock The Lost (except during a Challenge or Victory Lap).
• The Wafer, Cancer, and Percs reduce the spikes' damage to half a heart, allowing the player to make more sacrifices.
• If using the BASE MENT seed, the Dark Room teleport can escape the infinite Basement levels.
• Even if The Negative isn't unlocked, the player can still teleport to the Dark Room.
  • This allows players to challenge The Lamb without facing Satan, Mom's Heart/It Lives, or even Mom.
• Dying and respawning does not affect the number of sacrifices made, so Dead Cat can be used on low health in an attempt to acquire soul hearts.

Unlockable Achievements

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  The Lost - It's complicated
  Die in a Sacrifice Room while holding Missing Poster.

Trivia

• It is possible to use a Sacrifice Room to access the Dark Room while in Endless Mode. This can be used to start a Victory Lap while the BASE MENT seed is active.
• Because of the way Sacrifice rooms are generated, it is best to have less than 2 keys to prevent a Dice Room from replacing it and to have total health greater than or equal to your total heart containers when entering a new floor if you want to maximize your chances of generating a sacrifice room.

Bugs

Bug!	Found HUD will incorrectly display Angel Room generation chance at 100% when receiving either of the "You feel blessed!" effects.

Bug!	If Isaac touches a Red Chest, the game will determine whether or not he gets a Devil/Angel room that floor even if he doesn't teleport, which nullifies the Angel Room chance boosts and can cause him to teleport into a Devil Room instead of an Angel Room on the 6th use.

The Binding of Isaac: Rebirth
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