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Changes: Boss Rush

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* Each boss will drop [[Red Heart]]s on normal difficulty. {{i|Dark Bum}} can turn these into [[Soul Heart]]s, providing loads of extra health.
  
* Each boss will drop [[Red Heart]]s on normal difficulty. {{i|Dark Bum}} can turn these into [[Soul Heart]]s, providing loads of extra health.
 
* Take out [[Carrion Queen]] quickly, as its [[red poop]]s will remain for the rest of the boss rush. They can be advantageous though, as other bosses can also take damage from these poops. In particular, bouncing bosses like [[The Hollow]] and [[The Husk]] can quickly kill themselves on contact.
  
* Take out [[Carrion Queen]] quickly, as its [[red poop]]s will remain for the rest of the boss rush. They can be advantageous though, as other bosses can also take damage from these poops. In particular, bouncing bosses like [[The Hollow]] and [[The Husk]] can quickly kill themselves on contact.
−
*All bosses with {{i|Brimstone}} laser attack could severely hurt or even one-shot-kill each other, especially {{dlc|a}}[[The Gate]]. It may be beneficial to focus on the other boss before killing them.
 +
*All bosses with {{i|Brimstone}} laser attack could severely hurt or even one-shot-kill each other, especially {{dlc|a}} [[The Gate]]. It may be beneficial to focus on the other boss before killing them.
 
* Wave 9 can be quite difficult as [[Monstro II]] (he always spawns on the left side) can catch the player off guard with an offscreen {{i|Brimstone}} laser. The [[black creep]] left by [[Gish]] will remain until he is killed.
  
* Wave 9 can be quite difficult as [[Monstro II]] (he always spawns on the left side) can catch the player off guard with an offscreen {{i|Brimstone}} laser. The [[black creep]] left by [[Gish]] will remain until he is killed.
 
* [[The Bloat]] + [[Mask of Infamy]] is one of the hardest waves, but [[The Bloat]] can be baited into destroying both the heart and the mask itself of the [[Mask of Infamy]] with its {{i|Brimstone}} lasers.
  
* [[The Bloat]] + [[Mask of Infamy]] is one of the hardest waves, but [[The Bloat]] can be baited into destroying both the heart and the mask itself of the [[Mask of Infamy]] with its {{i|Brimstone}} lasers.
 
* Any [[Teleport]] effect (such as [[card]]s, activated items, Telepills, etc) can be used to leave the Boss Rush. This can be used to gain one item without having to fight any bosses.
  
* Any [[Teleport]] effect (such as [[card]]s, activated items, Telepills, etc) can be used to leave the Boss Rush. This can be used to gain one item without having to fight any bosses.
  +
** After unlocking {{a|A Strange Door}}, [[Rocks#Marked_Skulls|Marked Skulls]] will always appear on Depths II and will always drop {{p|0 - The Fool}}, providing a guaranteed way to escape Boss Rush.
   
 
== Unlockable [[Achievement]]s ==
  
== Unlockable [[Achievement]]s ==

Revision as of 07:30, 12 June 2021

The Boss Rush is an optional room that becomes available by beating Mom (in The Depths, Necropolis and (in Afterbirth † and Repentance)Dank Depths) within 20 minutes, beating Mom (in (in Repentance) Mausoleum or (in Repentance) Gehenna) within 25 minutes.

In the center of a large room, there will be 4 random items to choose from. Picking up an item will cause the other three to disappear and start the Boss Rush. Completing the Boss Rush will also reward 1 more item, separate from the 4 seen when first entering the room.

(except in Rebirth) There is a chance that there will only be 2 items to choose from. Additionally, items may be trapped behind rocks or spikes. Items may appear in the corners of the room instead of the center.

(in Afterbirth † and Repentance) There is a small chance that there will be 8 items to choose from.

Waves

The Boss Rush consists of 15 waves with 2 bosses per wave. The next wave does not spawn until both bosses from the previous wave have been killed, and any lingering monsters from previous waves will not prevent the next wave from spawning.

Occasionally, all the bosses fought in the Boss Rush will be their Champion variants, if they have one.

Rebirth

All 15 waves are predetermined.

Afterbirth

All 15 waves are randomized, with each wave spawning two random bosses from the list. Each boss can only appear once per Boss Rush, meaning that out of all the 50 bosses Isaac will face 30 of them.

Boss Entity ID
3x Larry Jr. 19.0
3x The Hollow 19.1
Monstro 20.0
Chub 28.0
C.H.A.D. 28.1
Carrion Queen 28.2
Gurdy 36.0
Monstro II 43.0
Gish 43.1
Pin 62.0
The Frail 62.2
Famine 63.0
Pestilence 64.0
War 65.0
Death 66.0
The Duke of Flies 67.0
The Husk 67.1
Peep 68.0
The Bloat 68.1
Loki 69.0
Fistula 71.0
Blastocyst 74.0
Gemini 79.0
Steven 79.1
Blighted Ovum 79.2
The Fallen 81.0
The Headless Horseman 82.0
Mask of Infamy 97.0
Gurdy Jr. 99.0
Widow 100.0
The Wretched 100.1
3x Gurglings 237.1
3x Turdlings 237.2
The Haunt 260.0
Dingle 261.0
Dangle 261.1
Mega Maw 262.0
The Gate 263.0
Mega Fatty 264.0
The Cage 265.0
Dark One 267.0
The Adversary 268.0
Polycephalus 269.0
Uriel 271.0
Gabriel 272.0
The Stain 401.0
Brownie 402.0
The Forsaken 403.0
Little Horn 404.0
Rag Man 405.0

Note that all of the chapter 4 bosses (except Blastocyst and Death) are not present in the Boss Rush:

Furthermore, some other bosses are not present in the Boss Rush:

Layouts

  • Boss Rush 1.png
  • (except in Rebirth)
  • (except in Rebirth)
  • (except in Rebirth)
  • (except in Rebirth)
  • (in Afterbirth † and Repentance)

Notes

  • If Mom is beaten within 20 minutes and Isaac enters the Devil Room, he must return to the boss room before 20 minutes have passed; otherwise, the Boss Rush entrance will be closed.
    • If Isaac is teleported to the Devil Room while inside the Boss Rush room (for example, using a JokerJoker card), exiting the Devil Room will lead him to Mom's Boss Room.
  • If Isaac dies during the Boss Rush, but is able to respawn, the entrance to the Boss Rush room will still be open if the timer is still under 20 minutes. If the Boss Rush entrance has closed, the room can still be re-entered by dying in the Mom boss fight room at the cost of another life.
  • The Boss Rush can only be retried by picking up an item off a pedestal in its room. If the item Isaac originally picked from the room was an active type, the pedestal and item it was swapped out for will still be there. Swapping the items again will restart the fight. Alternatively, a new pedestal can be created, such as through a XX - JudgementXX - Judgement card, and taking its item will also restart the fight.
  • (except in Rebirth) If a Sack spawns for whatever reason, picking it up will start the Boss Rush. The player can still pick up one of the pedestal items.
  • The boss rush does not unlock anything if beaten in a challenge.
  • (in Afterbirth † and Repentance) Using Collectible Void iconVoid or the Black RuneBlack Rune will start the Boss Rush.
  • If a chest is opened in the Boss Rush room, it will start the Boss Rush
  • (in Afterbirth † and Repentance)Collectible Mama Mega! iconMama Mega! will open the Boss Rush room even if the time limit has expired.
  • Holding (in Afterbirth † and Repentance)Collectible Broken Shovel 1 iconBroken Shovel will also open the Boss Rush room ignoring time limit to complete (in Afterbirth † and Repentance)Collectible Mom's Shovel iconMom's Shovel.
  • If a Crawl Space is entered from within the Boss Rush room, exiting the Crawl Space will not return the player to the Boss Rush room, but will instead place the player back in the Mom Boss Room.

Tips

  • The player's playtime can be checked at any moment by pressing TAB (or long-pressing SELECT on the controller), enabling Extra HUD in the options menu, or by simply looking down to the bottom screen on the 3DS version, where it is shown on the map.
  • Each boss will drop Red Hearts on normal difficulty. Collectible Dark Bum iconDark Bum can turn these into Soul Hearts, providing loads of extra health.
  • Take out Carrion Queen quickly, as its red poops will remain for the rest of the boss rush. They can be advantageous though, as other bosses can also take damage from these poops. In particular, bouncing bosses like The Hollow and The Husk can quickly kill themselves on contact.
  • All bosses with Collectible Brimstone iconBrimstone laser attack could severely hurt or even one-shot-kill each other, especially (except in Rebirth) The Gate. It may be beneficial to focus on the other boss before killing them.
  • Wave 9 can be quite difficult as Monstro II (he always spawns on the left side) can catch the player off guard with an offscreen Collectible Brimstone iconBrimstone laser. The black creep left by Gish will remain until he is killed.
  • The Bloat + Mask of Infamy is one of the hardest waves, but The Bloat can be baited into destroying both the heart and the mask itself of the Mask of Infamy with its Collectible Brimstone iconBrimstone lasers.
  • Any Teleport effect (such as cards, activated items, Telepills, etc) can be used to leave the Boss Rush. This can be used to gain one item without having to fight any bosses.

Unlockable Achievements

Gallery

  • A drawn concept of Boss Rush by Edmund McMillen.

    A drawn concept of Boss Rush by Edmund McMillen.

Trivia

  • Despite battling bosses from the floors before, a few bosses from WombWomb will spawn such as Blastocyst and Death.
  • Despite the Timer seen between level transitions appearing, Boss Rush cannot be done the first time the player defeats Mom. Instead, the game will cut directly to the Epilogue.
  • (in Repentance) Armageddon is the theme for the Boss Rush added in The Binding of Isaac: Repentance.

Bugs

Bug Bug! It is possible for item pedestals to spawn on red poop (which can be spawned by Carrion Queen or red Dingle) or spikes. Attempting to pick up the item will damage Isaac.
Bug Bug! One of the possible layouts for the Boss Rush room will have spikes near the location that an item pedestal spawns after completing the fight. If you possess "There's Options", one of the item pedestals can appear in the same place as the spikes, causing you to take damage by picking that item up.
Bug Bug! Entering Boss Rush after the 20 minutes (killing Mom before it, but waiting to enter) and using Glowing Hour Glass will crash the game.


Room 1x1 Rooms Room 1x1
Unlocked
Boss Room Icon
Boss Room
Mini-Boss Room Icon
Mini-Boss Room
Curse Room Icon
Curse Room
Sacrifice Room Icon
Sacrifice Room 		(except in Rebirth)
Room 1x1 small
Closet 		(in Afterbirth † and Repentance)
Room 1x1
Grave Room
Locked
Treasure Room Icon
Treasure Room
Shop Icon
Shop
Library Icon
Library 		(in Repentance)
Planetarium Icon
Planetarium
Slotted
Arcade Icon
Arcade
Barred
Challenge Room Icon
Challenge Room
Boss Challenge Room Icon
Boss Challenge Room
Double-locked
Vault Icon
Vault
Dice Room Icon
Dice Room
Double-boarded
Bedroom Icon Dirty Bedroom Icon
Clean/Dirty Bedroom
Hidden
Secret Room Icon
Secret Room
Super Secret Room Icon
Super Secret Room
Crawl Space Icon
Crawl Space
Black Market Icon
Black Market
Error Room Icon
I AM ERROR 		(in Repentance)
Ultra Secret Room Icon
Ultra Secret Room
Post-boss
Devil Room Icon
Devil Room
Angel Room Icon
Angel Room
Boss Rush Icon
Boss Rush 		(except in Rebirth)
Super Secret Room Icon
Blue Womb Entrance
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