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The Binding of Isaac: Antibirth
An unofficial, fan-made expansion.
Created 1 year 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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man i installed it properly and such but when I open it it stays black for like 15 secs and then it says it hasstopped working and reporting ht e problem to microsoft what do I do???
it doesn't work, it starts the unmodded rebirth
omg ppl think it's a goddamn virus because it's an exe xD
its .exe lel can anyone tell me where the real one is?
not all .exe files are viruses the binding of isaac is a .exe and .ng file
It's an exe file because antibirth adds new content to the original game. Unlike in AB+, non-exe mods can only edit existing items and characters. Thus, antibirth uses an exe file to install the extra content
can you make the mod for afterbirth and afterbirth+?
Rebirth only works with this, not AB or AB+.
so i tried to make it work on afterbirth + and it didn't work
That's because it's a rebirth mod- c
hey for people complaining about the darn Download. when you install Antibirth. Unzip it outside of the Rebirth Folder. i placed mine on the desktop.
November 2, 2017 - 6 months 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!

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