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The Binding of Isaac: Antibirth
An unofficial, fan-made expansion.
Created 12 months ago

This is an official post by the Antibirth team. Proof here.

Five years ago, a young boy took his first trip down into the basement, facing the endless threats below to escape from the murderous delusions of his loving mother. Three years later, he found himself facing the same predicament but with an even greater plague of horrors and peril. Very shortly afterward, a modest few among us decided that even this was not enough. In the two years since then, fate has worked tirelessly to place by far the most fearsome challenge yet in his path. This time, Isaac will face our free and fan-made The Binding of Isaac: Rebirth expansion, Antibirth. So what exactly is in store for him?

  • 2 new characters with unique playstyles
  • 90+ new collectible items to help Isaac fight
  • 18+ new trinkets to swap and strategize with
  • 80+ new enemies to face one after another
  • 16+ new bosses to kill or be killed by
  • 4000+ new rooms to explore and survive
  • A new secret final chapter for Isaac to endure
  • Bigger and greater secrets than ever before
  • Several new or enhanced features for local cooperative play
  • A nearly full and original new soundtrack, evocative of classic Isaac

The Binding of Isaac has had one of the most involved and robust communities of fans around since its initial release and has inspired countless players and developers with its peculiar sensibilities and creative blend of roguelike flavor. As its zealous modding community has proved, it’s only natural that many among us would feel the urge to try to help carry the torch and make it partly our own, but Antibirth was the first and is presently the only Isaac mod to reach deep into the core of Rebirth to enable the depth and scope of a full expansion, aspiring even to the size of the official DLC, Afterbirth. If you’ve become as enraptured with Isaac as the rest of us and you still want more, we’re here to provide our absolute best — and more of it than you’ve ever dreamed of — all for free.


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You know, you guy's should put this on the steam workshop so people could play it easier. I mean, it's nod bad to download it, but it's nice to subscribe to it on the workshop, and play the mod from there. The mod is great, though. I played it on my old PC and adored it.
This is actually the best thing ever.
This mod is sick, cant wait for the update
When will it be out for afterbirth?
i can't find "the pile" is just him to i finally unlock the new stages and i don't have necropolis someone help me
It's Crashes every time. Can someone help?
Probably a conflict with some other mods you have installed.
Why i don't have this special entrance to new "stages"
and you unlock with killing the new bosses
i have a question
i beat all new bosses baby plum,reap creep and the pile then i quit the run and started new one.
but the thing is that i dont understand how to unlock new floors
kill all new bosses in 1 run or something cuz i really dont understand
i think u need to use the new character the girl
first kill all the new bosses then either kill your self or finish the run one of those 2 ways any other dont work
The best mod i have ever seen. Tottaly love it.
TO EVERYONE READING THIS!!, theres an update on that page letting everyone know whats going on. please examine it carefully
아니 이거 어떻게적용해요?
Honestly my favorite Isaac mod. So much effort put in to it. I give my gratitude to all the people that made this mod.
i cant get it to work it says it isnt reasponding :'(
THIS IS FREAKING FANTASTIC This is done with SO much effort, and it payed off so good! You should have been a team in the actual development, as this could easily slip in as a DLC more expensive than even Afterbirth+
Is this compatible with afterbirth or do I have to deactivate the dlc beforehand?
November 2, 2017 - 1 month ago

We now have a store with modding-related and Antibirth shirts, with designs by the amazing Elko! The price may be going up a little soon, so if you wanted to get them at the lowest price they will be, now is the time. Special thanks to DragonoidSlayer for helping get this set up!

Store Page