History YMMV / TheBindingOfIsaacAntibirth

** Donkey Jawbone, a new item unlocked by defeating [[spoiler:The Witness]] with Samson, is a nod to a story from the Bible in which Samson kills one thousand Philistines with only the jawbone of a donkey.

* BetterThanCanon: Once the official ''Afterbirth+'' DLC came out, several people were disappointed by its lack of content and argued ''Antibirth'' turned out to be the more creative and engaging of the two. Even the ''Antibirth'' dev team was [[https://www.reddit.com/r/bindingofisaac/comments/5m3aau/on_antibirth_and_afterbirth_compatibility/?st=ixl56w4c&sh=77dcd5e6 reportedly mad]] at ''Afterbirth+'s'' final chapter (a case of ItsTheSameNowItSucks as the level is [[spoiler:a remix of all previous levels ending with a boss that shapeshifts into previous bosses]]) and how its modding tools were barely usable at launch.

* GameBreaker: The Red Key. Using it can create an entirely new room. This room can be anything from a regular enemy-filled room,to an item room (Even on floors where they wouldn't normally spawn),to a [[DealWithTheDevil Devil Deal]],and so on. By creating enough rooms to leave an invisible 13 x 13 grid,the player can even create an I AM ERROR room,and skip to the next floor [[note]] Except in Sheol,where going down the trapdoor in an Error room will [[GameBreakingBug crash the game]].[[/note]] . The real kicker comes in when you do this in [[spoiler: The Chest or the Dark Room]],which resets the floor... Allowing the player to get more items,and repeat the process, ad infinium.

** Akeldama, which is unlocked by Judas after defeating [[spoiler:The Witness]], is a pile of entrails that lets Isaac leave a trail of bloody tears that hit foes. It's a reference to Judas' suicide in Literature/TheBible: he hung himself in Akeldama, and when he died his organs spilled out of his body.

** Also in the Bible, there's the story of how Jacob tricked Esau by offering him a delicious stew in exchange for the birthright to their dying father's possessions. In the game, Red Stew gives a short-range benefit (refills health and provides a great, but temporary, damage boost), while Birthright has a different permanent effect depending on the character that picks it up. In the case of Jacob and Esau, the one who picks it up copies three of the other's passive items.

** The new chapter, [[spoiler:Corpse]], is the unholy love child between this and NauseaFuel. [[spoiler:It's the Womb chapter, but after the destruction of Mom's heart. As a result, the entire level is dead and rotting, and is teeming with enemies that are either rotting away ''(with visible skeletons)'' or feasting on the decaying meat. And let's not even get started on [[https://www.youtube.com/watch?v=C3nVDn22LPA the music that plays]], which feels like something out of a CreepyPasta]].
** The music that plays after [[spoiler:killing Mom's Heart on the Alternate Route, but before entering the Corpse]], "[[https://www.youtube.com/watch?v=yxZM2CULRNE Spinning Intensifies]]". It may have a silly name, but it sounds like [[Franchise/{{Pokemon}} Lavender Town]], [[VideoGame/SonicExe HILL Act 1]], and [[WebVideo/BenDrowned the Reverse Song of Healing]] all rolled into one. It's almost as if the game is telling you "you've made a horrible, horrible mistake" -- not completely unfounded, since [[spoiler:you just killed your mother]].

*** A honorable mention for the most nightmarish item is "2Spooky". Silly name aside,the item causes Isaac to turn blood red,and [[https://antibirth.gamepedia.com/media/antibirth.gamepedia.com/5/55/2Spooky_App.png?version=c9efd6ad02813dbfd2b1d7fbc6e099b3 give him a screaming face with hellish pupils]]. Hell,its effect is to make any enemies in a short range gain a [[StandardStatusEffect fear effect]], making it nightmare fuel InUniverse.

* ThatOneBoss: The Heretic is an advanced form of The Haunt, and he lives up to his predecessor's reputation and then some. He starts the fight sending five flunkies with homing bullets at you - potentially annoying, but not difficult. But when they go down, The Heretic himself starts attacking, and pain ensues. He can charge at you repeatedly from alternating sides of the room for a full heart of damage, and to make things worse, he will home in on you slightly and can ''fake you out'' on the last charge. In addition, he can rain homing explosive tears at you from above, and possesses a Brimstone attack that bounces between the fireplaces in his boss room and will likely take up most of the room. It's not uncommon for players to leave the fight with five or six hearts less than they had when they entered.
* ThatOneSidequest: The Bloody Mary challenge. You start as Bethany with Book of Belial instead of Virtues, Anemic, Blood Bag for extra starting health and speed, Child's Heart to increase red heart spawns, and there's no treasure rooms. Doesn't sound too bad? Well, you're also given Blood Oath, which reduces your red heart count to just half in the start of every single floor except the first. This would not be a problem for any other character due to soul hearts not being depleted, except Bethany cannot add soul hearts to her health. Or black or immortal hearts. This means that you're effectively a OneHitPointWonder starting in Basement II and must pray to the random number generator that you'll get some kind of ''red'' heart pickup, and pray again after advancing to the next stage, and so on. Due to a bug, picking up any rotten hearts all-but guarantees death at the start of the next floor, due to the way Blood Oath's health subtraction does not take into account the fact that rotten hearts are always lost in terms of whole hearts, never halves. The goal of this challenge is Satan.

* ThatOneSidequest: The Bloody Mary challenge. You start as Bethany with Book of Belial instead of Virtues, Anemic, Blood Bag for extra starting health and speed, Child's Heart to increase red heart spawns, and there's no treasure rooms. Doesn't sound too bad? Well, you're also given Blood Oath, which reduces your red heart count to just half in the start of every single floor except the first. This would not be a problem for any other character due to soul hearts not being depleted, except Bethany cannot add soul hearts to her health. Or black or eternal hearts. This means that you're effectively a OneHitPointWonder starting in Basement II and must pray to the random number generator that you'll get some kind of ''red'' heart pickup, and pray again after advancing to the next stage, and so on. Due to a bug, picking up any rotten hearts all-but guarantees death at the start of the next floor, due to the way Blood Oath's health subtraction does not take into account the fact that rotten hearts are always lost in terms of whole hearts, never halves. The goal of this challenge is Satan.

* GameBreaker: The Red Key. Using it can create an entirely new room. This room can be anything from a regular enemy-filled room,to an item room (Even on floors where they wouldn't normally spawn),to a [[DealWithTheDevil Devil Deal]],and so on. By creating enough rooms to leave an invisible 13 x 13 grid,the player can even create an I AM ERROR room,and skip to the next floor [[note]] Except in Sheol,where going down the trapdoor in an Error room will [[GameBreakingBug crash the game]].[[/note]] . The real kicker comes in when you do this in [[spoiler: The Chest or the Dark Room]],which resets the floor... Allowing the player to get more items,and repeat the process,ad infinium.

*** A honorable mention for the most nightmarish item is "2Spooky". Silly name aside,the item causes Isaac to turn blood red,and [[https://antibirth.gamepedia.com/media/antibirth.gamepedia.com/5/55/2Spooky_App.png?version=c9efd6ad02813dbfd2b1d7fbc6e099b3 give him a screaming face with hellish pupils]]. Hell,its effect is to make any enemies in a short range gain a [[StandardStatusEffect fear effect]],making it nightmare fuel InUniverse.

* AntiClimaxBoss: While [[spoiler:The Witness]], the final boss of the Alternate Route, is undeniably [[BestBossEver an awesome boss]], it lacks one thing that the {{true final boss}}es from ''Afterbirth'' and ''Afterbirth+'' had: [[DamageSpongeBoss scaling damage resistance]]. Because of this, it's possible to steamroll through it with the right items; for example, a familiar that can home in on and attack enemies, like a Level 3 or 4 Meat Boy. Worse, if you managed to even get to it in the first place, chances are you're powerful enough to just stamp through, so steamrolls are more likely than a true ClimaxBoss fight.
* AwesomeMusic: The mod has all [[https://www.youtube.com/watch?v=c5gejcfpr1w&list=PLkpGvIpK1f3r6yTChZtlzn-kj5uWHS77v original music]], even for the vanilla floors, and they are all of professional quality.
* BestBossEver: The final boss of the Alternate Route, [[spoiler:The Witness, an [[NonHumanUndead undead Mama Gurdy]]]]. The mod drops all pretenses and flat-out ''indulges'' in insane BulletHell, with grids of bullets, lasers, shock waves, and enemy summons. And once you've depeleted its health, [[spoiler:[[TurnsRed the boss' head bursts out of its body and keeps attacking]]]]!

* BetterThanCanon: Once the official ''Afterbirth+'' DLC came out, several people were disappointed by its lack of content and argued ''Antibirth'' turned out to be the more creative and engaging of the two. Even the ''Antibirth'' dev team was [[https://www.reddit.com/r/bindingofisaac/comments/5m3aau/on_antibirth_and_afterbirth_compatibility/?st=ixl56w4c&sh=77dcd5e6 reportedly mad]] at ''Afterbirth+'s'' final chapter (a case of ItsTheSameSoItSucks as the level is [[spoiler:a remix of all previous levels ending with a boss that shapeshifts into previous bosses]]) and how its modding tools were barely usable at launch.

** The new chapter, [[spoiler:Corpse]], is the unholy love child between this and NauseaFuel. [[spoiler:It's the Womb chapter, but after the destruction of Mom's heart. As a result, the entire level is dead and rotting, and is teeming with enemies that are either rotting away ''(with visible skeletons)'' or feasting on the decaying meat. And let's not even get started on [[https://www.youtube.com/watch?v=C3nVDn22LPA the music that plays]], which feels like something out of a Main/CreepyPasta]].

* AntiClimaxBoss: While [[spoiler:The Witness]], the final boss of the Alternate Route, is undeniably [[BestBossEver an awesome boss]], it lacks one thing that the {{true final boss}}es from ''Afterbirth'' and ''Afterbirth+'' had: [[DamageSpongeBoss scaling damage resistance]]. Because of this, it's possible to steamroll through it with the right items; for example, a familiar that can home in on and attack enemies, like a Level 3 or 4 Meat Boy.

** Akeldama, which is unlocked by Judas after defeating [[spoiler:The Witness]], is a pile on entrails that lets Isaac leave a trail of bloody tears that hit foes. It's a reference to Judas' suicide in Literature/TheBible: he hung himself in Akeldama, and when he died his organs spilled out of his body.
** Donkey Jawbone, a new item unlocked by defeating [[spoiler:The Witness]] with Sampson, is a nod to a story from the Bible in which Sampson kills one thousand Philistines with only the jawbone of a donkey.

** The music that plays after [[spoiler: killing Mom's Heart on the Alternate Route, but before entering the Corpse]], "[[https://www.youtube.com/watch?v=yxZM2CULRNE Spinning Intensifies]]". It may have a silly name, but it sounds like [[Franchise/{{Pokemon}} Lavender Town]], [[VideoGame/SonicExe HILL Act 1]], and [[WebVideo/BenDrowned the Reverse Song of Healing]] all rolled into one. It's almost as if the game is telling you "you've made a horrible, horrible mistake"- not completely unfounded, since [[spoiler:you just killed your mother]].

* AwesomeMusic: The mod has all [[https://www.youtube.com/playlist?list=PLkpGvIpK1f3r6yTChZtlzn-kj5uWHS77v original music]], even for the vanilla floors, and they are all of professional quality.

* AwesomeMusic: The mod has all original music, even for the vanilla floors, and they are all of professional quality.

** The new chapter, [[spoiler:Corpse]], is the unholy love child between this and NauseaFuel. [[spoiler:It's the Womb chapter, but after the destruction of Mom's heart. As a result, the entire level is dead and rotting, and is teeming with enemies that are either rotting away ''(with visible skeletons)'' or feasting on the decaying meat. And let's not even get started on [[https://www.youtube.com/watch?v=C3nVDn22LPA the music that plays]], which feels like something out of a WebOriginal/CreepyPasta]].

** The music that plays after [[spoiler: killing Mom's Heart on the Alternate Route, but before entering the Corpse]], "[[https://www.youtube.com/watch?v=yxZM2CULRNE Spinning Intensifies]]". It may have a silly name, but it sounds like [[Franchise/{{Pokemon}} Lavender Town]], [[VideoGame/SonicExe HILL Act 1]], and [[WebOriginal/BenDrowned the Reverse Song of Healing]] all rolled into one. It's almost as if the game is telling you "you've made a horrible, horrible mistake"- not completely unfounded, since [[spoiler:you just killed your mother]].

** The music that plays after [[spoiler: killing Mom's Heart on the Alternate Route, but before entering the Corpse]], "[[https://www.youtube.com/watch?v=yxZM2CULRNE Spinning Intensifies]]". It may have a silly name, but it sounds like [[Franchise/{{Pokemon}} Lavender Town]], [[WebOriginal/SonicExe HILL Act 1]], and [[WebOriginal/BenDrowned the Reverse Song of Healing]] all rolled into one. It's almost as if the game is telling you "you've made a horrible, horrible mistake"- not completely unfounded, since [[spoiler:you just killed your mother]].

** The music that plays after [[spoiler: killing Mom's Heart on the Alternate Route, but before entering the Corpse]], "[[https://www.youtube.com/watch?v=yxZM2CULRNE Spinning Intensifies]]". It may have a silly name, but it sounds like [[Franchise/{{Pokemon}} Lavender Town]], [[WebOriginal/SonicExe HILL Act 1]], and [[WebOriginal/BenDrowned the Reverse Song of Healing]] all rolled into one. It's almost as if the game is telling you "you've made a horrible, horrible mistake"- not completely unfounded, since [[spoiler:you just killed you mother]].

* BestBossEver: The final boss of the Alternate Route, [[spoiler:TheWitness, an [[NonHumanUndead undead Mama Gurdy]]]]. The mod drops all pretenses and flat-out ''indulges'' in insane BulletHell, with grids of bullets, lasers, shock waves, and enemy summons. And once you've depeleted its health, [[spoiler:[[TurnsRed the boss' head bursts out of its body and keeps attacking]]]]!

* BetterThanCanon: Once the official ''Afterbirth+'' DLC came out, several people were disappointed by its lack of content and argued ''Antibirth'' turned out to be the more creative and engaging of the two. Even the ''Antibirth'' dev team was reportedly mad at ''Afterbirth+'s'' final chapter (a case of ItsTheSameSoItSucks as the level is [[spoiler:a remix of all previous levels ending with a boss that shapeshifts into previous bosses]]) and how its modding tools were barely usable at launch.

* AntiClimaxBoss: While [[spoiler:The Witness]], the final boss of the Alternate Route, is undeniably [[BestBossEver an awesome boss]], it lacks one thing that the {{TrueFinalBoss|es}} from ''Afterbirth'' and ''Afterbirth+'' had: [[DamageSpongeBoss scaling damage resistance]]. Because of this, it's possible to steamroll through it with the right items; for example, a familiar that can home in on and attack enemies, like a Level 3 or 4 Meat Boy.